21021210020195 has 16 divisors (see below), whose sum is σ = 31449914212608. Its totient is φ = 13104130921440.

The previous prime is 21021210020177. The next prime is 21021210020207. The reversal of 21021210020195 is 59102001212012.

It is not a de Polignac number, because 21021210020195 - 2⁸ = 21021210019939 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27300272369 + ... + 27300273138.

It is an arithmetic number, because the mean of its divisors is an integer number (1965619638288).

Almost surely, 2^{21021210020195} is an apocalyptic number.

21021210020195 is a deficient number, since it is larger than the sum of its proper divisors (10428704192413).

21021210020195 is a wasteful number, since it uses less digits than its factorization.

21021210020195 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54600545530.

The product of its (nonzero) digits is 720, while the sum is 26.

The spelling of 21021210020195 in words is "twenty-one trillion, twenty-one billion, two hundred ten million, twenty thousand, one hundred ninety-five".