312110320021 has 4 divisors (see below), whose sum is σ = 312111656332. Its totient is φ = 312108983712.

The previous prime is 312110320019. The next prime is 312110320033. The reversal of 312110320021 is 120023011213.

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 202738570225 + 109371749796 = 450265^2 + 330714^2 .

It is a cyclic number.

It is not a de Polignac number, because 312110320021 - 2¹ = 312110320019 is a prime.

It is a super-2 number, since 2×312110320021² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 312110319977 and 312110320004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (312110320001) 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, 215670 + ... + 818983.

It is an arithmetic number, because the mean of its divisors is an integer number (78027914083).

Almost surely, 2^312110320021 is an apocalyptic number.

It is an amenable number.

312110320021 is a deficient number, since it is larger than the sum of its proper divisors (1336311).

312110320021 is a wasteful number, since it uses less digits than its factorization.

312110320021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1336310.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 312110320021 its reverse (120023011213), we get a palindrome (432133331234).

The spelling of 312110320021 in words is "three hundred twelve billion, one hundred ten million, three hundred twenty thousand, twenty-one".