23972319521 has 2 divisors, whose sum is σ = 23972319522. Its totient is φ = 23972319520.

The previous prime is 23972319493. The next prime is 23972319583. The reversal of 23972319521 is 12591327932.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22867488400 + 1104831121 = 151220^2 + 33239^2 .

It is a cyclic number.

It is not a de Polignac number, because 23972319521 - 2³⁴ = 6792450337 is a prime.

It is not a weakly prime, because it can be changed into another prime (23972319421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11986159760 + 11986159761.

It is an arithmetic number, because the mean of its divisors is an integer number (11986159761).

Almost surely, 2^23972319521 is an apocalyptic number.

It is an amenable number.

23972319521 is a deficient number, since it is larger than the sum of its proper divisors (1).

23972319521 is an equidigital number, since it uses as much as digits as its factorization.

23972319521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 204120, while the sum is 44.

The spelling of 23972319521 in words is "twenty-three billion, nine hundred seventy-two million, three hundred nineteen thousand, five hundred twenty-one".