21731347360 has 48 divisors (see below), whose sum is σ = 51350805576. Its totient is φ = 8690761728.

The previous prime is 21731347349. The next prime is 21731347369. The reversal of 21731347360 is 6374313712.

It can be written as a sum of positive squares in 4 ways, for example, as 10713906064 + 11017441296 = 103508^2 + 104964^2 .

It is not an unprimeable number, because it can be changed into a prime (21731347369) 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, 1003204 + ... + 1024636.

Almost surely, 2^21731347360 is an apocalyptic number.

21731347360 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21731347360 is an abundant number, since it is smaller than the sum of its proper divisors (29619458216).

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

21731347360 is a wasteful number, since it uses less digits than its factorization.

21731347360 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27785 (or 27777 counting only the distinct ones).

The product of its (nonzero) digits is 63504, while the sum is 37.

The spelling of 21731347360 in words is "twenty-one billion, seven hundred thirty-one million, three hundred forty-seven thousand, three hundred sixty".