312112421 has 2 divisors, whose sum is σ = 312112422. Its totient is φ = 312112420.

The previous prime is 312112393. The next prime is 312112429. The reversal of 312112421 is 124211213.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 214300321 + 97812100 = 14639^2 + 9890^2 .

It is a cyclic number.

It is not a de Polignac number, because 312112421 - 2²⁶ = 245003557 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 312112421.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (312112429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 156056210 + 156056211.

It is an arithmetic number, because the mean of its divisors is an integer number (156056211).

Almost surely, 2^312112421 is an apocalyptic number.

It is an amenable number.

312112421 is a deficient number, since it is larger than the sum of its proper divisors (1).

312112421 is an equidigital number, since it uses as much as digits as its factorization.

312112421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 96, while the sum is 17.

The square root of 312112421 is about 17666.7037389548. The cubic root of 312112421 is about 678.3237410816.

Adding to 312112421 its reverse (124211213), we get a palindrome (436323634).

The spelling of 312112421 in words is "three hundred twelve million, one hundred twelve thousand, four hundred twenty-one".