21660543232 has 36 divisors (see below), whose sum is σ = 43417503360. Its totient is φ = 10784926208.

The previous prime is 21660543221. The next prime is 21660543241. The reversal of 21660543232 is 23234506612.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 115828 + ... + 238195.

It is an arithmetic number, because the mean of its divisors is an integer number (1206041760).

Almost surely, 2^21660543232 is an apocalyptic number.

It is an amenable number.

21660543232 is an abundant number, since it is smaller than the sum of its proper divisors (21756960128).

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

21660543232 is an equidigital number, since it uses as much as digits as its factorization.

21660543232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 354278 (or 354264 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 34.

The spelling of 21660543232 in words is "twenty-one billion, six hundred sixty million, five hundred forty-three thousand, two hundred thirty-two".