21100120210 has 64 divisors (see below), whose sum is σ = 42539777280. Its totient is φ = 7484762880.

The previous prime is 21100120207. The next prime is 21100120211. The reversal of 21100120210 is 1202100112.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is not an unprimeable number, because it can be changed into a prime (21100120211) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 310051 + ... + 371929.

It is an arithmetic number, because the mean of its divisors is an integer number (664684020).

Almost surely, 2^21100120210 is an apocalyptic number.

21100120210 is an abundant number, since it is smaller than the sum of its proper divisors (21439657070).

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

21100120210 is a wasteful number, since it uses less digits than its factorization.

21100120210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62003.

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 21100120210 its reverse (1202100112), we get a palindrome (22302220322).

The spelling of 21100120210 in words is "twenty-one billion, one hundred million, one hundred twenty thousand, two hundred ten".