313012120021 has 12 divisors (see below), whose sum is σ = 319096409380. Its totient is φ = 307041770880.

The previous prime is 313012120013. The next prime is 313012120051. The reversal of 313012120021 is 120021210313.

It can be written as a sum of positive squares in 6 ways, for example, as 93131780625 + 219880339396 = 305175^2 + 468914^2 .

It is not a de Polignac number, because 313012120021 - 2³ = 313012120013 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 313012119977 and 313012120004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (313012120051) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 18702385 + ... + 18719113.

Almost surely, 2^313012120021 is an apocalyptic number.

It is an amenable number.

313012120021 is a deficient number, since it is larger than the sum of its proper divisors (6084289359).

313012120021 is an equidigital number, since it uses as much as digits as its factorization.

313012120021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23496 (or 23443 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 313012120021 its reverse (120021210313), we get a palindrome (433033330334).

The spelling of 313012120021 in words is "three hundred thirteen billion, twelve million, one hundred twenty thousand, twenty-one".