23261621 has 2 divisors, whose sum is σ = 23261622. Its totient is φ = 23261620.

The previous prime is 23261617. The next prime is 23261633. The reversal of 23261621 is 12616232.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 23174596 + 87025 = 4814^2 + 295^2 .

It is a cyclic number.

It is not a de Polignac number, because 23261621 - 2² = 23261617 is a prime.

It is a super-2 number, since 2×23261621² = 1082206023095282, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23261521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11630810 + 11630811.

It is an arithmetic number, because the mean of its divisors is an integer number (11630811).

Almost surely, 2^23261621 is an apocalyptic number.

It is an amenable number.

23261621 is a deficient number, since it is larger than the sum of its proper divisors (1).

23261621 is an equidigital number, since it uses as much as digits as its factorization.

23261621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 864, while the sum is 23.

The square root of 23261621 is about 4823.0302715202. The cubic root of 23261621 is about 285.4609182766.

Adding to 23261621 its reverse (12616232), we get a palindrome (35877853).

It can be divided in two parts, 2 and 3261621, that added together give a palindrome (3261623).

The spelling of 23261621 in words is "twenty-three million, two hundred sixty-one thousand, six hundred twenty-one".