21120122202210 has 160 divisors (see below), whose sum is σ = 56886856519680. Its totient is φ = 5622399226368.

The previous prime is 21120122202181. The next prime is 21120122202253. The reversal of 21120122202210 is 1220222102112.

It is a happy number.

21120122202210 is a `hidden beast` number, since 21 + 1 + 201 + 2 + 220 + 221 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 2500306207 + ... + 2500314653.

It is an arithmetic number, because the mean of its divisors is an integer number (355542853248).

Almost surely, 2^{21120122202210} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21120122202210, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28443428259840).

21120122202210 is an abundant number, since it is smaller than the sum of its proper divisors (35766734317470).

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

21120122202210 is a wasteful number, since it uses less digits than its factorization.

21120122202210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13382 (or 13373 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 21120122202210 its reverse (1220222102112), we get a palindrome (22340344304322).

The spelling of 21120122202210 in words is "twenty-one trillion, one hundred twenty billion, one hundred twenty-two million, two hundred two thousand, two hundred ten".