21437232036 has 24 divisors (see below), whose sum is σ = 54567500064. Its totient is φ = 6496130880.

The previous prime is 21437232031. The next prime is 21437232119. The reversal of 21437232036 is 63023273412.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a junction number, because it is equal to n+sod(n) for n = 21437231988 and 21437232006.

It is not an unprimeable number, because it can be changed into a prime (21437232031) 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, 81201505 + ... + 81201768.

It is an arithmetic number, because the mean of its divisors is an integer number (2273645836).

Almost surely, 2^21437232036 is an apocalyptic number.

It is an amenable number.

21437232036 is an abundant number, since it is smaller than the sum of its proper divisors (33130268028).

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

21437232036 is a wasteful number, since it uses less digits than its factorization.

21437232036 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 162403291 (or 162403289 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 33.

The spelling of 21437232036 in words is "twenty-one billion, four hundred thirty-seven million, two hundred thirty-two thousand, thirty-six".