21230052812 has 12 divisors (see below), whose sum is σ = 39338039160. Its totient is φ = 9990613056.

The previous prime is 21230052799. The next prime is 21230052817. The reversal of 21230052812 is 21825003212.

It is not an unprimeable number, because it can be changed into a prime (21230052817) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 156103262 + ... + 156103397.

It is an arithmetic number, because the mean of its divisors is an integer number (3278169930).

Almost surely, 2^21230052812 is an apocalyptic number.

It is an amenable number.

21230052812 is a deficient number, since it is larger than the sum of its proper divisors (18107986348).

21230052812 is a wasteful number, since it uses less digits than its factorization.

21230052812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 312206680 (or 312206678 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 26.

The spelling of 21230052812 in words is "twenty-one billion, two hundred thirty million, fifty-two thousand, eight hundred twelve".