23923195921 has 2 divisors, whose sum is σ = 23923195922. Its totient is φ = 23923195920.

The previous prime is 23923195909. The next prime is 23923195951. The reversal of 23923195921 is 12959132932.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22488301521 + 1434894400 = 149961^2 + 37880^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23923195921 is a prime.

It is not a weakly prime, because it can be changed into another prime (23923195951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11961597960 + 11961597961.

It is an arithmetic number, because the mean of its divisors is an integer number (11961597961).

Almost surely, 2^23923195921 is an apocalyptic number.

It is an amenable number.

23923195921 is a deficient number, since it is larger than the sum of its proper divisors (1).

23923195921 is an equidigital number, since it uses as much as digits as its factorization.

23923195921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 262440, while the sum is 46.

The spelling of 23923195921 in words is "twenty-three billion, nine hundred twenty-three million, one hundred ninety-five thousand, nine hundred twenty-one".