315112321421 has 4 divisors (see below), whose sum is σ = 320278097244. Its totient is φ = 309946545600.

The previous prime is 315112321397. The next prime is 315112321423. The reversal of 315112321421 is 124123211513.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 29407105225 + 285705216196 = 171485^2 + 534514^2 .

It is a cyclic number.

It is not a de Polignac number, because 315112321421 - 2³⁰ = 314038579597 is a prime.

It is a super-2 number, since 2×315112321421² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (315112321423) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2582887820 + ... + 2582887941.

It is an arithmetic number, because the mean of its divisors is an integer number (80069524311).

Almost surely, 2^315112321421 is an apocalyptic number.

It is an amenable number.

315112321421 is a deficient number, since it is larger than the sum of its proper divisors (5165775823).

315112321421 is an equidigital number, since it uses as much as digits as its factorization.

315112321421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5165775822.

The product of its digits is 1440, while the sum is 26.

Adding to 315112321421 its reverse (124123211513), we get a palindrome (439235532934).

The spelling of 315112321421 in words is "three hundred fifteen billion, one hundred twelve million, three hundred twenty-one thousand, four hundred twenty-one".