23711921 has 2 divisors, whose sum is σ = 23711922. Its totient is φ = 23711920.

The previous prime is 23711893. The next prime is 23711953. The reversal of 23711921 is 12911732.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16313521 + 7398400 = 4039^2 + 2720^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23711921 is a prime.

It is equal to p_1490192 and since 23711921 and 1490192 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (23711971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11855960 + 11855961.

It is an arithmetic number, because the mean of its divisors is an integer number (11855961).

Almost surely, 2^23711921 is an apocalyptic number.

It is an amenable number.

23711921 is a deficient number, since it is larger than the sum of its proper divisors (1).

23711921 is an equidigital number, since it uses as much as digits as its factorization.

23711921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 756, while the sum is 26.

The square root of 23711921 is about 4869.4887822029. The cubic root of 23711921 is about 287.2911491387.

The spelling of 23711921 in words is "twenty-three million, seven hundred eleven thousand, nine hundred twenty-one".