312131212021 has 8 divisors (see below), whose sum is σ = 312412193280. Its totient is φ = 311850295488.

The previous prime is 312131211983. The next prime is 312131212037. The reversal of 312131212021 is 120212131213.

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 312131212021 - 2²⁷ = 311996994293 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 312131212021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (312131215021) 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 7 ways as a sum of consecutive naturals, for example, 19118700 + ... + 19135018.

It is an arithmetic number, because the mean of its divisors is an integer number (39051524160).

Almost surely, 2^312131212021 is an apocalyptic number.

It is an amenable number.

312131212021 is a deficient number, since it is larger than the sum of its proper divisors (280981259).

312131212021 is a wasteful number, since it uses less digits than its factorization.

312131212021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32363.

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 312131212021 its reverse (120212131213), we get a palindrome (432343343234).

The spelling of 312131212021 in words is "three hundred twelve billion, one hundred thirty-one million, two hundred twelve thousand, twenty-one".