21996759966720 has 352 divisors, whose sum is σ = 87715655986176. Its totient is φ = 4570755072000.

The previous prime is 21996759966673. The next prime is 21996759966751. The reversal of 21996759966720 is 2766995769912.

It is a tau number, because it is divible by the number of its divisors (352).

It is a Smith number, since the sum of its digits (78) coincides with the sum of the digits of its prime factors.

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, 8116506 + ... + 10481945.

Almost surely, 2^{21996759966720} is an apocalyptic number.

21996759966720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21996759966720 is an abundant number, since it is smaller than the sum of its proper divisors (65718896019456).

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

21996759966720 is a wasteful number, since it uses less digits than its factorization.

21996759966720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18598497 (or 18598479 counting only the distinct ones).

The product of its (nonzero) digits is 1388832480, while the sum is 78.

The spelling of 21996759966720 in words is "twenty-one trillion, nine hundred ninety-six billion, seven hundred fifty-nine million, nine hundred sixty-six thousand, seven hundred twenty".