21022111210212 has 72 divisors (see below), whose sum is σ = 60731007209600. Its totient is φ = 6006271627008.

The previous prime is 21022111210141. The next prime is 21022111210259. The reversal of 21022111210212 is 21201211122012.

21022111210212 is a `hidden beast` number, since 2 + 10 + 221 + 11 + 210 + 212 = 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 23 ways as a sum of consecutive naturals, for example, 46211964 + ... + 46664652.

Almost surely, 2^{21022111210212} is an apocalyptic number.

It is an amenable number.

21022111210212 is an abundant number, since it is smaller than the sum of its proper divisors (39708895999388).

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

21022111210212 is a wasteful number, since it uses less digits than its factorization.

21022111210212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 636985 (or 636980 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 21022111210212 its reverse (21201211122012), we get a palindrome (42223322332224).

The spelling of 21022111210212 in words is "twenty-one trillion, twenty-two billion, one hundred eleven million, two hundred ten thousand, two hundred twelve".