312133313221 has 4 divisors (see below), whose sum is σ = 317250252844. Its totient is φ = 307016373600.

The previous prime is 312133313171. The next prime is 312133313257. The reversal of 312133313221 is 122313331213.

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 3565284100 + 308568029121 = 59710^2 + 555489^2 .

It is a cyclic number.

It is not a de Polignac number, because 312133313221 - 2¹⁷ = 312133182149 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (312133313021) 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, 2558469720 + ... + 2558469841.

It is an arithmetic number, because the mean of its divisors is an integer number (79312563211).

Almost surely, 2^312133313221 is an apocalyptic number.

It is an amenable number.

312133313221 is a deficient number, since it is larger than the sum of its proper divisors (5116939623).

312133313221 is an equidigital number, since it uses as much as digits as its factorization.

312133313221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5116939622.

The product of its digits is 1944, while the sum is 25.

Adding to 312133313221 its reverse (122313331213), we get a palindrome (434446644434).

The spelling of 312133313221 in words is "three hundred twelve billion, one hundred thirty-three million, three hundred thirteen thousand, two hundred twenty-one".