23321681 has 2 divisors, whose sum is σ = 23321682. Its totient is φ = 23321680.

The previous prime is 23321663. The next prime is 23321687. The reversal of 23321681 is 18612332.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18105025 + 5216656 = 4255^2 + 2284^2 .

It is a cyclic number.

It is not a de Polignac number, because 23321681 - 2²² = 19127377 is a prime.

It is a super-2 number, since 2×23321681² = 1087801609331522, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 23321681.

It is not a weakly prime, because it can be changed into another prime (23321687) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11660840 + 11660841.

It is an arithmetic number, because the mean of its divisors is an integer number (11660841).

Almost surely, 2^23321681 is an apocalyptic number.

It is an amenable number.

23321681 is a deficient number, since it is larger than the sum of its proper divisors (1).

23321681 is an equidigital number, since it uses as much as digits as its factorization.

23321681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1728, while the sum is 26.

The square root of 23321681 is about 4829.2526336898. The cubic root of 23321681 is about 285.7063876745.

The spelling of 23321681 in words is "twenty-three million, three hundred twenty-one thousand, six hundred eighty-one".