312021130320 has 100 divisors (see below), whose sum is σ = 1083695633460. Its totient is φ = 83205633024.

The previous prime is 312021130303. The next prime is 312021130321. The reversal of 312021130320 is 23031120213.

312021130320 is a `hidden beast` number, since 31 + 202 + 113 + 0 + 320 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 75370015296 + 236651115024 = 274536^2 + 486468^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 312021130293 and 312021130302.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (312021130321) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 24069225 + ... + 24082184.

Almost surely, 2^312021130320 is an apocalyptic number.

312021130320 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

312021130320 is an abundant number, since it is smaller than the sum of its proper divisors (771674503140).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

312021130320 is a wasteful number, since it uses less digits than its factorization.

312021130320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48151434 (or 48151419 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

Adding to 312021130320 its reverse (23031120213), we get a palindrome (335052250533).

The spelling of 312021130320 in words is "three hundred twelve billion, twenty-one million, one hundred thirty thousand, three hundred twenty".