315660123451021 has 2 divisors, whose sum is σ = 315660123451022. Its totient is φ = 315660123451020.

The previous prime is 315660123451009. The next prime is 315660123451063. The reversal of 315660123451021 is 120154321066513.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 219979740177796 + 95680383273225 = 14831714^2 + 9781635^2 .

It is a cyclic number.

It is not a de Polignac number, because 315660123451021 - 2²¹ = 315660121353869 is a prime.

It is a super-2 number, since 2×315660123451021² (a number of 30 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (315660123451091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 157830061725510 + 157830061725511.

It is an arithmetic number, because the mean of its divisors is an integer number (157830061725511).

Almost surely, 2^{315660123451021} is an apocalyptic number.

It is an amenable number.

315660123451021 is a deficient number, since it is larger than the sum of its proper divisors (1).

315660123451021 is an equidigital number, since it uses as much as digits as its factorization.

315660123451021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 129600, while the sum is 40.

The spelling of 315660123451021 in words is "three hundred fifteen trillion, six hundred sixty billion, one hundred twenty-three million, four hundred fifty-one thousand, twenty-one".