21052455313 has 2 divisors, whose sum is σ = 21052455314. Its totient is φ = 21052455312.

The previous prime is 21052455301. The next prime is 21052455337. The reversal of 21052455313 is 31355425012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17180131329 + 3872323984 = 131073^2 + 62228^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21052455313 is a prime.

It is not a weakly prime, because it can be changed into another prime (21052452313) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10526227656 + 10526227657.

It is an arithmetic number, because the mean of its divisors is an integer number (10526227657).

Almost surely, 2^21052455313 is an apocalyptic number.

It is an amenable number.

21052455313 is a deficient number, since it is larger than the sum of its proper divisors (1).

21052455313 is an equidigital number, since it uses as much as digits as its factorization.

21052455313 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18000, while the sum is 31.

The spelling of 21052455313 in words is "twenty-one billion, fifty-two million, four hundred fifty-five thousand, three hundred thirteen".