913013031320021 has 2 divisors, whose sum is σ = 913013031320022. Its totient is φ = 913013031320020.

The previous prime is 913013031319969. The next prime is 913013031320053. The reversal of 913013031320021 is 120023130310319.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 514418235024100 + 398594796295921 = 22680790^2 + 19964839^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-913013031320021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (913013031323021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 456506515660010 + 456506515660011.

It is an arithmetic number, because the mean of its divisors is an integer number (456506515660011).

Almost surely, 2^{913013031320021} is an apocalyptic number.

It is an amenable number.

913013031320021 is a deficient number, since it is larger than the sum of its proper divisors (1).

913013031320021 is an equidigital number, since it uses as much as digits as its factorization.

913013031320021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2916, while the sum is 29.

The spelling of 913013031320021 in words is "nine hundred thirteen trillion, thirteen billion, thirty-one million, three hundred twenty thousand, twenty-one".