21211102122222 has 32 divisors (see below), whose sum is σ = 42482661249024. Its totient is φ = 7060298040000.

The previous prime is 21211102122181. The next prime is 21211102122311. The reversal of 21211102122222 is 22222120111212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11585013 + ... + 13290399.

It is an arithmetic number, because the mean of its divisors is an integer number (1327583164032).

Almost surely, 2^{21211102122222} is an apocalyptic number.

21211102122222 is an abundant number, since it is smaller than the sum of its proper divisors (21271559126802).

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

21211102122222 is a wasteful number, since it uses less digits than its factorization.

21211102122222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1708344.

The product of its (nonzero) digits is 256, while the sum is 21.

Adding to 21211102122222 its reverse (22222120111212), we get a palindrome (43433222233434).

The spelling of 21211102122222 in words is "twenty-one trillion, two hundred eleven billion, one hundred two million, one hundred twenty-two thousand, two hundred twenty-two".