315132021 has 24 divisors (see below), whose sum is σ = 468378560. Its totient is φ = 204088896.

The previous prime is 315132007. The next prime is 315132029. The reversal of 315132021 is 120231513.

It is a de Polignac number, because none of the positive numbers 2^k-315132021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 315131985 and 315132003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (315132029) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 40440 + ... + 47598.

Almost surely, 2^315132021 is an apocalyptic number.

It is an amenable number.

315132021 is a deficient number, since it is larger than the sum of its proper divisors (153246539).

315132021 is a wasteful number, since it uses less digits than its factorization.

315132021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7305 (or 7302 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 18.

The square root of 315132021 is about 17751.9582300094. The cubic root of 315132021 is about 680.5042547255.

Adding to 315132021 its reverse (120231513), we get a palindrome (435363534).

The spelling of 315132021 in words is "three hundred fifteen million, one hundred thirty-two thousand, twenty-one".