21746831960 has 32 divisors (see below), whose sum is σ = 55920425760. Its totient is φ = 7456056576.

The previous prime is 21746831947. The next prime is 21746831989. The reversal of 21746831960 is 6913864712.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38833349 + ... + 38833908.

It is an arithmetic number, because the mean of its divisors is an integer number (1747513305).

Almost surely, 2^21746831960 is an apocalyptic number.

21746831960 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21746831960 is an abundant number, since it is smaller than the sum of its proper divisors (34173593800).

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

21746831960 is a wasteful number, since it uses less digits than its factorization.

21746831960 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77667275 (or 77667271 counting only the distinct ones).

The product of its (nonzero) digits is 435456, while the sum is 47.

The spelling of 21746831960 in words is "twenty-one billion, seven hundred forty-six million, eight hundred thirty-one thousand, nine hundred sixty".