312012210021 has 16 divisors (see below), whose sum is σ = 452392905024. Its totient is φ = 190481220864.

The previous prime is 312012210017. The next prime is 312012210053. The reversal of 312012210021 is 120012210213.

It is not a de Polignac number, because 312012210021 - 2² = 312012210017 is a prime.

It is a super-2 number, since 2×312012210021² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (312012210011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 82672255 + ... + 82676028.

It is an arithmetic number, because the mean of its divisors is an integer number (28274556564).

Almost surely, 2^312012210021 is an apocalyptic number.

It is an amenable number.

312012210021 is a deficient number, since it is larger than the sum of its proper divisors (140380695003).

312012210021 is a wasteful number, since it uses less digits than its factorization.

312012210021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 165348340.

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 312012210021 its reverse (120012210213), we get a palindrome (432024420234).

The spelling of 312012210021 in words is "three hundred twelve billion, twelve million, two hundred ten thousand, twenty-one".