23931458821 has 2 divisors, whose sum is σ = 23931458822. Its totient is φ = 23931458820.

The previous prime is 23931458783. The next prime is 23931458843. The reversal of 23931458821 is 12885413932.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20122841025 + 3808617796 = 141855^2 + 61714^2 .

It is a cyclic number.

It is not a de Polignac number, because 23931458821 - 2¹³ = 23931450629 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23931458021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11965729410 + 11965729411.

It is an arithmetic number, because the mean of its divisors is an integer number (11965729411).

Almost surely, 2^23931458821 is an apocalyptic number.

It is an amenable number.

23931458821 is a deficient number, since it is larger than the sum of its proper divisors (1).

23931458821 is an equidigital number, since it uses as much as digits as its factorization.

23931458821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 414720, while the sum is 46.

The spelling of 23931458821 in words is "twenty-three billion, nine hundred thirty-one million, four hundred fifty-eight thousand, eight hundred twenty-one".