21630763687680 has 1440 divisors, whose sum is σ = 93266236546560. Its totient is φ = 4676170383360.

The previous prime is 21630763687679. The next prime is 21630763687717. The reversal of 21630763687680 is 8678636703612.

21630763687680 is a `hidden beast` number, since 2 + 1 + 63 + 0 + 76 + 368 + 76 + 80 = 666.

It is a tau number, because it is divible by the number of its divisors (1440).

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 12975862207 + ... + 12975863873.

It is an arithmetic number, because the mean of its divisors is an integer number (64768219824).

Almost surely, 2^{21630763687680} is an apocalyptic number.

21630763687680 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 21630763687680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (46633118273280).

21630763687680 is an abundant number, since it is smaller than the sum of its proper divisors (71635472858880).

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

21630763687680 is a wasteful number, since it uses less digits than its factorization.

21630763687680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2667 (or 2644 counting only the distinct ones).

The product of its (nonzero) digits is 73156608, while the sum is 63.

The spelling of 21630763687680 in words is "twenty-one trillion, six hundred thirty billion, seven hundred sixty-three million, six hundred eighty-seven thousand, six hundred eighty".