312112021 has 8 divisors (see below), whose sum is σ = 336435680. Its totient is φ = 287833392.

The previous prime is 312111977. The next prime is 312112033. The reversal of 312112021 is 120211213.

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

It is a cyclic number.

It is not a de Polignac number, because 312112021 - 2²⁵ = 278557589 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 312111992 and 312112010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (312112081) 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, 3910 + ... + 25288.

It is an arithmetic number, because the mean of its divisors is an integer number (42054460).

Almost surely, 2^312112021 is an apocalyptic number.

It is an amenable number.

312112021 is a deficient number, since it is larger than the sum of its proper divisors (24323659).

312112021 is a wasteful number, since it uses less digits than its factorization.

312112021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22515.

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 312112021 is about 17666.6924182202. The cubic root of 312112021 is about 678.3234513039.

Adding to 312112021 its reverse (120211213), we get a palindrome (432323234).

The spelling of 312112021 in words is "three hundred twelve million, one hundred twelve thousand, twenty-one".