23516621 has 2 divisors, whose sum is σ = 23516622. Its totient is φ = 23516620.

The previous prime is 23516611. The next prime is 23516677. The reversal of 23516621 is 12661532.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14546596 + 8970025 = 3814^2 + 2995^2 .

It is a cyclic number.

It is not a de Polignac number, because 23516621 - 2¹⁸ = 23254477 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23516611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11758310 + 11758311.

It is an arithmetic number, because the mean of its divisors is an integer number (11758311).

Almost surely, 2^23516621 is an apocalyptic number.

It is an amenable number.

23516621 is a deficient number, since it is larger than the sum of its proper divisors (1).

23516621 is an equidigital number, since it uses as much as digits as its factorization.

23516621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2160, while the sum is 26.

The square root of 23516621 is about 4849.3938796514. The cubic root of 23516621 is about 286.5002289368.

The spelling of 23516621 in words is "twenty-three million, five hundred sixteen thousand, six hundred twenty-one".