21721014360 has 48 divisors (see below), whose sum is σ = 70593297840. Its totient is φ = 5792270400.

The previous prime is 21721014353. The next prime is 21721014379. The reversal of 21721014360 is 6341012712.

21721014360 is a `hidden beast` number, since 2 + 17 + 210 + 1 + 436 + 0 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 30167716 + ... + 30168435.

It is an arithmetic number, because the mean of its divisors is an integer number (1470693705).

Almost surely, 2^21721014360 is an apocalyptic number.

21721014360 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21721014360 is an abundant number, since it is smaller than the sum of its proper divisors (48872283480).

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

21721014360 is a wasteful number, since it uses less digits than its factorization.

21721014360 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60336168 (or 60336161 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

The spelling of 21721014360 in words is "twenty-one billion, seven hundred twenty-one million, fourteen thousand, three hundred sixty".