210021220191 has 16 divisors (see below), whose sum is σ = 296510782464. Its totient is φ = 131773471104.

The previous prime is 210021220183. The next prime is 210021220193. The reversal of 210021220191 is 191022120012.

It is not a de Polignac number, because 210021220191 - 2³ = 210021220183 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210021220193) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2015026 + ... + 2116688.

It is an arithmetic number, because the mean of its divisors is an integer number (18531923904).

Almost surely, 2^210021220191 is an apocalyptic number.

210021220191 is a deficient number, since it is larger than the sum of its proper divisors (86489562273).

210021220191 is a wasteful number, since it uses less digits than its factorization.

210021220191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142190.

The product of its (nonzero) digits is 144, while the sum is 21.

The spelling of 210021220191 in words is "two hundred ten billion, twenty-one million, two hundred twenty thousand, one hundred ninety-one".