22021012212 has 24 divisors (see below), whose sum is σ = 51563932896. Its totient is φ = 7314398688.

The previous prime is 22021012157. The next prime is 22021012229. The reversal of 22021012212 is 21221012022.

It is a junction number, because it is equal to n+sod(n) for n = 22021012191 and 22021012200.

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, 3238803 + ... + 3245594.

It is an arithmetic number, because the mean of its divisors is an integer number (2148497204).

Almost surely, 2^22021012212 is an apocalyptic number.

It is an amenable number.

22021012212 is an abundant number, since it is smaller than the sum of its proper divisors (29542920684).

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

22021012212 is a wasteful number, since it uses less digits than its factorization.

22021012212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6484687 (or 6484685 counting only the distinct ones).

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

Adding to 22021012212 its reverse (21221012022), we get a palindrome (43242024234).

The spelling of 22021012212 in words is "twenty-two billion, twenty-one million, twelve thousand, two hundred twelve".