23185621 has 2 divisors, whose sum is σ = 23185622. Its totient is φ = 23185620.

The previous prime is 23185577. The next prime is 23185639. The reversal of 23185621 is 12658132.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23174596 + 11025 = 4814^2 + 105^2 .

It is a cyclic number.

It is not a de Polignac number, because 23185621 - 2⁹ = 23185109 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 23185621.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23185321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11592810 + 11592811.

It is an arithmetic number, because the mean of its divisors is an integer number (11592811).

Almost surely, 2^23185621 is an apocalyptic number.

It is an amenable number.

23185621 is a deficient number, since it is larger than the sum of its proper divisors (1).

23185621 is an equidigital number, since it uses as much as digits as its factorization.

23185621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2880, while the sum is 28.

The square root of 23185621 is about 4815.1449614731. The cubic root of 23185621 is about 285.1496946236.

The spelling of 23185621 in words is "twenty-three million, one hundred eighty-five thousand, six hundred twenty-one".