21211222120202 has 16 divisors (see below), whose sum is σ = 31910991957000. Its totient is φ = 10574251415040.

The previous prime is 21211222120163. The next prime is 21211222120211. The reversal of 21211222120202 is 20202122211212.

It can be written as a sum of positive squares in 4 ways, for example, as 19655292698041 + 1555929422161 = 4433429^2 + 1247369^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5057999 + ... + 8246562.

Almost surely, 2^{21211222120202} is an apocalyptic number.

21211222120202 is a deficient number, since it is larger than the sum of its proper divisors (10699769836798).

21211222120202 is a wasteful number, since it uses less digits than its factorization.

21211222120202 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13306921.

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 21211222120202 its reverse (20202122211212), we get a palindrome (41413344331414).

The spelling of 21211222120202 in words is "twenty-one trillion, two hundred eleven billion, two hundred twenty-two million, one hundred twenty thousand, two hundred two".