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We report on the multi-frequency timing observations of 21 pulsars discoveredin the LOFAR Tied-Array All-Sky Survey (LOTAAS). The timing data were taken atcentral frequencies of 149 MHz (LOFAR) as well as 334 and 1532 MHz (LovellTelecope). The sample of pulsars includes 20 isolated pulsars and the firstbinary pulsar discovered by the survey, PSR J1658$+$3630. We modelled thetiming properties of the pulsars, which showed that they have, on average,larger characteristic ages. We present the pulse profiles of the pulsars acrossthe three observing bands, where PSR J1643$+$1338 showed profile evolution thatappears not to be well-described by the radius-to-frequency-mapping model.Furthermore, we modelled the spectra of the pulsars across the same observingbands, using a simple power law, and found an average spectral index of $-1.9\pm 0.5$. Amongst the pulsars studied here, PSR J1657$+$3304 showed large fluxdensity variations of a factor of 10 over 300 days, as well as mode changingand nulling on timescales of a few minutes. We modelled the rotational andorbital properties of PSR J1658$+$3630, which has a spin period of 33 ms in abinary orbit of 3.0 days with a companion of minimum mass of 0.87$M_{\odot}$,likely a Carbon-Oxygen or Oxygen-Neon-Magnesium type white dwarf. PSRJ1658$+$3630 has a dispersion measure of 3.0 pc cm$^{-3}$, making it possiblyone of the closest binary pulsars known.

The LOFAR Tied-Array All-Sky Survey: Timing of 21 pulsars including the first binary pulsar discovered with LOFAR