21631599736 has 16 divisors (see below), whose sum is σ = 40570498800. Its totient is φ = 10812800064.

The previous prime is 21631599727. The next prime is 21631599767. The reversal of 21631599736 is 63799513612.

It is a super-2 number, since 2×21631599736² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 344181 + ... + 402148.

It is an arithmetic number, because the mean of its divisors is an integer number (2535656175).

Almost surely, 2^21631599736 is an apocalyptic number.

It is an amenable number.

21631599736 is a deficient number, since it is larger than the sum of its proper divisors (18938899064).

21631599736 is a wasteful number, since it uses less digits than its factorization.

21631599736 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 749958 (or 749954 counting only the distinct ones).

The product of its digits is 1837080, while the sum is 52.

The spelling of 21631599736 in words is "twenty-one billion, six hundred thirty-one million, five hundred ninety-nine thousand, seven hundred thirty-six".