315231131021 has 8 divisors (see below), whose sum is σ = 333809206080. Its totient is φ = 296851752288.

The previous prime is 315231131003. The next prime is 315231131071. The reversal of 315231131021 is 120131132513.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-315231131021 is a prime.

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 (315231131071) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 49670816 + ... + 49677161.

It is an arithmetic number, because the mean of its divisors is an integer number (41726150760).

Almost surely, 2^315231131021 is an apocalyptic number.

It is an amenable number.

315231131021 is a deficient number, since it is larger than the sum of its proper divisors (18578075059).

315231131021 is a wasteful number, since it uses less digits than its factorization.

315231131021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99348163.

The product of its (nonzero) digits is 540, while the sum is 23.

Adding to 315231131021 its reverse (120131132513), we get a palindrome (435362263534).

The spelling of 315231131021 in words is "three hundred fifteen billion, two hundred thirty-one million, one hundred thirty-one thousand, twenty-one".