23443921 has 2 divisors, whose sum is σ = 23443922. Its totient is φ = 23443920.

The previous prime is 23443907. The next prime is 23443951. The reversal of 23443921 is 12934432.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22695696 + 748225 = 4764^2 + 865^2 .

It is a cyclic number.

It is not a de Polignac number, because 23443921 - 2⁷ = 23443793 is a prime.

It is equal to p_1474408 and since 23443921 and 1474408 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 23443921.

It is not a weakly prime, because it can be changed into another prime (23443951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11721960 + 11721961.

It is an arithmetic number, because the mean of its divisors is an integer number (11721961).

Almost surely, 2^23443921 is an apocalyptic number.

It is an amenable number.

23443921 is a deficient number, since it is larger than the sum of its proper divisors (1).

23443921 is an equidigital number, since it uses as much as digits as its factorization.

23443921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5184, while the sum is 28.

The square root of 23443921 is about 4841.8922953738. The cubic root of 23443921 is about 286.2046923326.

The spelling of 23443921 in words is "twenty-three million, four hundred forty-three thousand, nine hundred twenty-one".