312120213213331 has 2 divisors, whose sum is σ = 312120213213332. Its totient is φ = 312120213213330.

The previous prime is 312120213213329. The next prime is 312120213213373. The reversal of 312120213213331 is 133312312021213.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 312120213213331 - 2¹ = 312120213213329 is a prime.

It is a super-2 number, since 2×312120213213331² (a number of 30 digits) contains 22 as substring.

Together with 312120213213329, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 312120213213331.

It is not a weakly prime, because it can be changed into another prime (312120213223331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 156060106606665 + 156060106606666.

It is an arithmetic number, because the mean of its divisors is an integer number (156060106606666).

Almost surely, 2^{312120213213331} is an apocalyptic number.

312120213213331 is a deficient number, since it is larger than the sum of its proper divisors (1).

312120213213331 is an equidigital number, since it uses as much as digits as its factorization.

312120213213331 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3888, while the sum is 28.

Adding to 312120213213331 its reverse (133312312021213), we get a palindrome (445432525234544).

The spelling of 312120213213331 in words is "three hundred twelve trillion, one hundred twenty billion, two hundred thirteen million, two hundred thirteen thousand, three hundred thirty-one".