21102120012210 has 64 divisors (see below), whose sum is σ = 50936992404480. Its totient is φ = 5594812957440.

The previous prime is 21102120012151. The next prime is 21102120012217. The reversal of 21102120012210 is 1221002120112.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 21102120012210.

It is not an unprimeable number, because it can be changed into a prime (21102120012217) 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, 22503999 + ... + 23422941.

It is an arithmetic number, because the mean of its divisors is an integer number (795890506320).

Almost surely, 2^{21102120012210} is an apocalyptic number.

21102120012210 is an abundant number, since it is smaller than the sum of its proper divisors (29834872392270).

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

21102120012210 is a wasteful number, since it uses less digits than its factorization.

21102120012210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 923363.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21102120012210 its reverse (1221002120112), we get a palindrome (22323122132322).

The spelling of 21102120012210 in words is "twenty-one trillion, one hundred two billion, one hundred twenty million, twelve thousand, two hundred ten".