23635621 has 2 divisors, whose sum is σ = 23635622. Its totient is φ = 23635620.

The previous prime is 23635607. The next prime is 23635631. The reversal of 23635621 is 12653632.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21958596 + 1677025 = 4686^2 + 1295^2 .

It is a cyclic number.

It is not a de Polignac number, because 23635621 - 2⁹ = 23635109 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 23635621.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23635631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11817810 + 11817811.

It is an arithmetic number, because the mean of its divisors is an integer number (11817811).

Almost surely, 2^23635621 is an apocalyptic number.

It is an amenable number.

23635621 is a deficient number, since it is larger than the sum of its proper divisors (1).

23635621 is an equidigital number, since it uses as much as digits as its factorization.

23635621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6480, while the sum is 28.

The square root of 23635621 is about 4861.6479716244. The cubic root of 23635621 is about 286.9826704279.

The spelling of 23635621 in words is "twenty-three million, six hundred thirty-five thousand, six hundred twenty-one".