23213681 has 2 divisors, whose sum is σ = 23213682. Its totient is φ = 23213680.

The previous prime is 23213669. The next prime is 23213711. The reversal of 23213681 is 18631232.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21298225 + 1915456 = 4615^2 + 1384^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23213681 is a prime.

It is a super-2 number, since 2×23213681² = 1077749971139522, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 23213681.

It is not a weakly prime, because it can be changed into another prime (23213651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11606840 + 11606841.

It is an arithmetic number, because the mean of its divisors is an integer number (11606841).

Almost surely, 2^23213681 is an apocalyptic number.

It is an amenable number.

23213681 is a deficient number, since it is larger than the sum of its proper divisors (1).

23213681 is an equidigital number, since it uses as much as digits as its factorization.

23213681 is an evil number, because the sum of its binary digits is even.

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

The square root of 23213681 is about 4818.0578037213. The cubic root of 23213681 is about 285.2646807578.

The spelling of 23213681 in words is "twenty-three million, two hundred thirteen thousand, six hundred eighty-one".