312112231021 has 4 divisors (see below), whose sum is σ = 312137107132. Its totient is φ = 312087354912.

The previous prime is 312112231019. The next prime is 312112231031. The reversal of 312112231021 is 120132211213.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 302264645796 + 9847585225 = 549786^2 + 99235^2 .

It is a cyclic number.

It is not a de Polignac number, because 312112231021 - 2¹ = 312112231019 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 312112231021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (312112231031) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12419226 + ... + 12444331.

It is an arithmetic number, because the mean of its divisors is an integer number (78034276783).

Almost surely, 2^312112231021 is an apocalyptic number.

It is an amenable number.

312112231021 is a deficient number, since it is larger than the sum of its proper divisors (24876111).

312112231021 is a wasteful number, since it uses less digits than its factorization.

312112231021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24876110.

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

Adding to 312112231021 its reverse (120132211213), we get a palindrome (432244442234).

The spelling of 312112231021 in words is "three hundred twelve billion, one hundred twelve million, two hundred thirty-one thousand, twenty-one".