21523633612 has 12 divisors (see below), whose sum is σ = 40563771136. Its totient is φ = 9933984720.

The previous prime is 21523633609. The next prime is 21523633619. The reversal of 21523633612 is 21633632512.

It is a hoax number, since the sum of its digits (34) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (21523633619) 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, 206957964 + ... + 206958067.

Almost surely, 2^21523633612 is an apocalyptic number.

It is an amenable number.

21523633612 is a deficient number, since it is larger than the sum of its proper divisors (19040137524).

21523633612 is a wasteful number, since it uses less digits than its factorization.

21523633612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 413916048 (or 413916046 counting only the distinct ones).

The product of its digits is 38880, while the sum is 34.

The spelling of 21523633612 in words is "twenty-one billion, five hundred twenty-three million, six hundred thirty-three thousand, six hundred twelve".