21022220212 has 24 divisors (see below), whose sum is σ = 42164931200. Its totient is φ = 8983703520.

The previous prime is 21022220201. The next prime is 21022220257. The reversal of 21022220212 is 21202222012.

It is a congruent number.

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, 1065864 + ... + 1085407.

Almost surely, 2^21022220212 is an apocalyptic number.

It is an amenable number.

21022220212 is an abundant number, since it is smaller than the sum of its proper divisors (21142710988).

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

21022220212 is a wasteful number, since it uses less digits than its factorization.

21022220212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2151631 (or 2151629 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 16.

Adding to 21022220212 its reverse (21202222012), we get a palindrome (42224442224).

The spelling of 21022220212 in words is "twenty-one billion, twenty-two million, two hundred twenty thousand, two hundred twelve".