312111000021 has 32 divisors (see below), whose sum is σ = 434378544768. Its totient is φ = 199168070400.

The previous prime is 312111000011. The next prime is 312111000043. The reversal of 312111000021 is 120000111213.

It is not a de Polignac number, because 312111000021 - 2⁶ = 312110999957 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 312110999970 and 312111000006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (312111000011) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1671466 + ... + 1848788.

It is an arithmetic number, because the mean of its divisors is an integer number (13574329524).

Almost surely, 2^312111000021 is an apocalyptic number.

It is an amenable number.

312111000021 is a deficient number, since it is larger than the sum of its proper divisors (122267544747).

312111000021 is a wasteful number, since it uses less digits than its factorization.

312111000021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 177621.

The product of its (nonzero) digits is 12, while the sum is 12.

Adding to 312111000021 its reverse (120000111213), we get a palindrome (432111111234).

The spelling of 312111000021 in words is "three hundred twelve billion, one hundred eleven million, twenty-one", and thus it is an aban number.