23131220213377 has 2 divisors, whose sum is σ = 23131220213378. Its totient is φ = 23131220213376.

The previous prime is 23131220213263. The next prime is 23131220213417. The reversal of 23131220213377 is 77331202213132.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19554446605681 + 3576773607696 = 4422041^2 + 1891236^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23131220213377 is a prime.

It is not a weakly prime, because it can be changed into another prime (23131220283377) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11565610106688 + 11565610106689.

It is an arithmetic number, because the mean of its divisors is an integer number (11565610106689).

Almost surely, 2^{23131220213377} is an apocalyptic number.

It is an amenable number.

23131220213377 is a deficient number, since it is larger than the sum of its proper divisors (1).

23131220213377 is an equidigital number, since it uses as much as digits as its factorization.

23131220213377 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 63504, while the sum is 37.

The spelling of 23131220213377 in words is "twenty-three trillion, one hundred thirty-one billion, two hundred twenty million, two hundred thirteen thousand, three hundred seventy-seven".