21163135155313 has 2 divisors, whose sum is σ = 21163135155314. Its totient is φ = 21163135155312.

The previous prime is 21163135155307. The next prime is 21163135155347. The reversal of 21163135155313 is 31355153136112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20003998691889 + 1159136463424 = 4472583^2 + 1076632^2 .

It is a cyclic number.

It is not a de Polignac number, because 21163135155313 - 2⁹ = 21163135154801 is a prime.

It is not a weakly prime, because it can be changed into another prime (21163135155353) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10581567577656 + 10581567577657.

It is an arithmetic number, because the mean of its divisors is an integer number (10581567577657).

Almost surely, 2^{21163135155313} is an apocalyptic number.

It is an amenable number.

21163135155313 is a deficient number, since it is larger than the sum of its proper divisors (1).

21163135155313 is an equidigital number, since it uses as much as digits as its factorization.

21163135155313 is an evil number, because the sum of its binary digits is even.

The product of its digits is 121500, while the sum is 40.

The spelling of 21163135155313 in words is "twenty-one trillion, one hundred sixty-three billion, one hundred thirty-five million, one hundred fifty-five thousand, three hundred thirteen".