23727934921 has 2 divisors, whose sum is σ = 23727934922. Its totient is φ = 23727934920.

The previous prime is 23727934897. The next prime is 23727934973. The reversal of 23727934921 is 12943972732.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11981710521 + 11746224400 = 109461^2 + 108380^2 .

It is a cyclic number.

It is not a de Polignac number, because 23727934921 - 2⁷ = 23727934793 is a prime.

It is a super-2 number, since 2×23727934921² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (23727934991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11863967460 + 11863967461.

It is an arithmetic number, because the mean of its divisors is an integer number (11863967461).

Almost surely, 2^23727934921 is an apocalyptic number.

It is an amenable number.

23727934921 is a deficient number, since it is larger than the sum of its proper divisors (1).

23727934921 is an equidigital number, since it uses as much as digits as its factorization.

23727934921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1143072, while the sum is 49.

The spelling of 23727934921 in words is "twenty-three billion, seven hundred twenty-seven million, nine hundred thirty-four thousand, nine hundred twenty-one".