21660627360 has 192 divisors, whose sum is σ = 70125834240. Its totient is φ = 5616952320.

The previous prime is 21660627349. The next prime is 21660627383. The reversal of 21660627360 is 6372606612.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4930765 + ... + 4935155.

It is an arithmetic number, because the mean of its divisors is an integer number (365238720).

Almost surely, 2^21660627360 is an apocalyptic number.

21660627360 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21660627360, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35062917120).

21660627360 is an abundant number, since it is smaller than the sum of its proper divisors (48465206880).

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

21660627360 is a wasteful number, since it uses less digits than its factorization.

21660627360 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4691 (or 4683 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 39.

The spelling of 21660627360 in words is "twenty-one billion, six hundred sixty million, six hundred twenty-seven thousand, three hundred sixty".