21100122210020 has 72 divisors (see below), whose sum is σ = 51545342471616. Its totient is φ = 7234221199296.

The previous prime is 21100122209983. The next prime is 21100122210053. The reversal of 21100122210020 is 2001222100112.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is a junction number, because it is equal to n+sod(n) for n = 21100122209977 and 21100122210004.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 96721907 + ... + 96939813.

It is an arithmetic number, because the mean of its divisors is an integer number (715907534328).

Almost surely, 2^{21100122210020} is an apocalyptic number.

21100122210020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21100122210020 is an abundant number, since it is smaller than the sum of its proper divisors (30445220261596).

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

21100122210020 is a wasteful number, since it uses less digits than its factorization.

21100122210020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 316737 (or 316728 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21100122210020 its reverse (2001222100112), we get a palindrome (23101344310132).

The spelling of 21100122210020 in words is "twenty-one trillion, one hundred billion, one hundred twenty-two million, two hundred ten thousand, twenty".