21100220200122 has 24 divisors (see below), whose sum is σ = 49090308221376. Its totient is φ = 6028634342808.

The previous prime is 21100220200021. The next prime is 21100220200211. The reversal of 21100220200122 is 22100202200112.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 35884727938 + ... + 35884728525.

It is an arithmetic number, because the mean of its divisors is an integer number (2045429509224).

Almost surely, 2^{21100220200122} is an apocalyptic number.

21100220200122 is an abundant number, since it is smaller than the sum of its proper divisors (27990088021254).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21100220200122 is a wasteful number, since it uses less digits than its factorization.

21100220200122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71769456482 (or 71769456475 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 21100220200122 its reverse (22100202200112), we get a palindrome (43200422400234).

The spelling of 21100220200122 in words is "twenty-one trillion, one hundred billion, two hundred twenty million, two hundred thousand, one hundred twenty-two".