236404895921 has 2 divisors, whose sum is σ = 236404895922. Its totient is φ = 236404895920.

The previous prime is 236404895761. The next prime is 236404895929. The reversal of 236404895921 is 129598404632.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 230626615696 + 5778280225 = 480236^2 + 76015^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-236404895921 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (236404895929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 118202447960 + 118202447961.

It is an arithmetic number, because the mean of its divisors is an integer number (118202447961).

Almost surely, 2^236404895921 is an apocalyptic number.

It is an amenable number.

236404895921 is a deficient number, since it is larger than the sum of its proper divisors (1).

236404895921 is an equidigital number, since it uses as much as digits as its factorization.

236404895921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3732480, while the sum is 53.

The spelling of 236404895921 in words is "two hundred thirty-six billion, four hundred four million, eight hundred ninety-five thousand, nine hundred twenty-one".