21211220022 has 32 divisors (see below), whose sum is σ = 42611837184. Its totient is φ = 7038900000.

The previous prime is 21211220021. The next prime is 21211220039. The reversal of 21211220022 is 22002211212.

It is a junction number, because it is equal to n+sod(n) for n = 21211219983 and 21211220010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21211220021) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1535647 + ... + 1549397.

It is an arithmetic number, because the mean of its divisors is an integer number (1331619912).

Almost surely, 2^21211220022 is an apocalyptic number.

21211220022 is an abundant number, since it is smaller than the sum of its proper divisors (21400617162).

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

21211220022 is a wasteful number, since it uses less digits than its factorization.

21211220022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14884.

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

Adding to 21211220022 its reverse (22002211212), we get a palindrome (43213431234).

The spelling of 21211220022 in words is "twenty-one billion, two hundred eleven million, two hundred twenty thousand, twenty-two".