21523224612 has 24 divisors (see below), whose sum is σ = 53175026016. Its totient is φ = 6752384128.

The previous prime is 21523224563. The next prime is 21523224617. The reversal of 21523224612 is 21642232512.

It is a self number, because there is not a number n which added to its sum of digits gives 21523224612.

It is not an unprimeable number, because it can be changed into a prime (21523224617) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 52752798 + ... + 52753205.

It is an arithmetic number, because the mean of its divisors is an integer number (2215626084).

Almost surely, 2^21523224612 is an apocalyptic number.

It is an amenable number.

21523224612 is an abundant number, since it is smaller than the sum of its proper divisors (31651801404).

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

21523224612 is a wasteful number, since it uses less digits than its factorization.

21523224612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105506027 (or 105506025 counting only the distinct ones).

The product of its digits is 11520, while the sum is 30.

The spelling of 21523224612 in words is "twenty-one billion, five hundred twenty-three million, two hundred twenty-four thousand, six hundred twelve".