21731796755997 has 16 divisors (see below), whose sum is σ = 29854029014208. Its totient is φ = 14052799617920.

The previous prime is 21731796755969. The next prime is 21731796756083. The reversal of 21731796755997 is 79955769713712.

It is a cyclic number.

It is not a de Polignac number, because 21731796755997 - 2⁸ = 21731796755741 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21731796755947) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 510618243 + ... + 510660800.

It is an arithmetic number, because the mean of its divisors is an integer number (1865876813388).

Almost surely, 2^{21731796755997} is an apocalyptic number.

It is an amenable number.

21731796755997 is a deficient number, since it is larger than the sum of its proper divisors (8122232258211).

21731796755997 is a wasteful number, since it uses less digits than its factorization.

21731796755997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1021279260.

The product of its digits is 1575296100, while the sum is 78.

The spelling of 21731796755997 in words is "twenty-one trillion, seven hundred thirty-one billion, seven hundred ninety-six million, seven hundred fifty-five thousand, nine hundred ninety-seven".