315268021 has 2 divisors, whose sum is σ = 315268022. Its totient is φ = 315268020.

The previous prime is 315267991. The next prime is 315268027. The reversal of 315268021 is 120862513.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 231344100 + 83923921 = 15210^2 + 9161^2 .

It is an emirp because it is prime and its reverse (120862513) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 315268021 - 2⁵ = 315267989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (315268027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 157634010 + 157634011.

It is an arithmetic number, because the mean of its divisors is an integer number (157634011).

Almost surely, 2^315268021 is an apocalyptic number.

It is an amenable number.

315268021 is a deficient number, since it is larger than the sum of its proper divisors (1).

315268021 is an equidigital number, since it uses as much as digits as its factorization.

315268021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 315268021 is about 17755.7883801311. The cubic root of 315268021 is about 680.6021346214.

The spelling of 315268021 in words is "three hundred fifteen million, two hundred sixty-eight thousand, twenty-one".