21102220002210 has 128 divisors (see below), whose sum is σ = 52512922425600. Its totient is φ = 5422852592640.

The previous prime is 21102220002191. The next prime is 21102220002233. The reversal of 21102220002210 is 1220002220112.

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 21102220002210.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 64793656 + ... + 65118524.

It is an arithmetic number, because the mean of its divisors is an integer number (410257206450).

Almost surely, 2^{21102220002210} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21102220002210, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26256461212800).

21102220002210 is an abundant number, since it is smaller than the sum of its proper divisors (31410702423390).

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

21102220002210 is a wasteful number, since it uses less digits than its factorization.

21102220002210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 325476.

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

Adding to 21102220002210 its reverse (1220002220112), we get a palindrome (22322222222322).

The spelling of 21102220002210 in words is "twenty-one trillion, one hundred two billion, two hundred twenty million, two thousand, two hundred ten".