23621999 has 2 divisors, whose sum is σ = 23622000. Its totient is φ = 23621998.

The previous prime is 23621977. The next prime is 23622017. The reversal of 23621999 is 99912632.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 23621999 - 2⁸ = 23621743 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23621909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11810999 + 11811000.

It is an arithmetic number, because the mean of its divisors is an integer number (11811000).

Almost surely, 2^23621999 is an apocalyptic number.

23621999 is a deficient number, since it is larger than the sum of its proper divisors (1).

23621999 is an equidigital number, since it uses as much as digits as its factorization.

23621999 is an evil number, because the sum of its binary digits is even.

The product of its digits is 52488, while the sum is 41.

The square root of 23621999 is about 4860.2468044329. The cubic root of 23621999 is about 286.9275272580.

The spelling of 23621999 in words is "twenty-three million, six hundred twenty-one thousand, nine hundred ninety-nine".