312020323121 has 4 divisors (see below), whose sum is σ = 336021886452. Its totient is φ = 288018759792.

The previous prime is 312020323079. The next prime is 312020323141. The reversal of 312020323121 is 121323020213.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 121323020213 = 73 ⋅1661959181.

It can be written as a sum of positive squares in 2 ways, for example, as 197971603600 + 114048719521 = 444940^2 + 337711^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-312020323121 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 312020323093 and 312020323102.

It is not an unprimeable number, because it can be changed into a prime (312020323141) 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, 12000781646 + ... + 12000781671.

It is an arithmetic number, because the mean of its divisors is an integer number (84005471613).

Almost surely, 2^312020323121 is an apocalyptic number.

It is an amenable number.

312020323121 is a deficient number, since it is larger than the sum of its proper divisors (24001563331).

312020323121 is a wasteful number, since it uses less digits than its factorization.

312020323121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24001563330.

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 312020323121 its reverse (121323020213), we get a palindrome (433343343334).

The spelling of 312020323121 in words is "three hundred twelve billion, twenty million, three hundred twenty-three thousand, one hundred twenty-one".