23317621 has 2 divisors, whose sum is σ = 23317622. Its totient is φ = 23317620.

The previous prime is 23317603. The next prime is 23317627. The reversal of 23317621 is 12671332.

23317621 = 3414² + 3415².

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11662225 + 11655396 = 3415^2 + 3414^2 .

It is a cyclic number.

It is not a de Polignac number, because 23317621 - 2⁵ = 23317589 is a prime.

It is a super-2 number, since 2×23317621² = 1087422898199282, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23317627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11658810 + 11658811.

It is an arithmetic number, because the mean of its divisors is an integer number (11658811).

Almost surely, 2^23317621 is an apocalyptic number.

23317621 is the 3415-th centered square number.

It is an amenable number.

23317621 is a deficient number, since it is larger than the sum of its proper divisors (1).

23317621 is an equidigital number, since it uses as much as digits as its factorization.

23317621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1512, while the sum is 25.

The square root of 23317621 is about 4828.8322604953. The cubic root of 23317621 is about 285.6898074624.

Adding to 23317621 its reverse (12671332), we get a palindrome (35988953).

The spelling of 23317621 in words is "twenty-three million, three hundred seventeen thousand, six hundred twenty-one".