312231421 has 2 divisors, whose sum is σ = 312231422. Its totient is φ = 312231420.

The previous prime is 312231379. The next prime is 312231467. The reversal of 312231421 is 124132213.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 218625796 + 93605625 = 14786^2 + 9675^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-312231421 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (312231121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 156115710 + 156115711.

It is an arithmetic number, because the mean of its divisors is an integer number (156115711).

Almost surely, 2^312231421 is an apocalyptic number.

It is an amenable number.

312231421 is a deficient number, since it is larger than the sum of its proper divisors (1).

312231421 is an equidigital number, since it uses as much as digits as its factorization.

312231421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 288, while the sum is 19.

The square root of 312231421 is about 17670.0713354531. The cubic root of 312231421 is about 678.4099389418.

Adding to 312231421 its reverse (124132213), we get a palindrome (436363634).

It can be divided in two parts, 3122 and 31421, that added together give a palindrome (34543).

The spelling of 312231421 in words is "three hundred twelve million, two hundred thirty-one thousand, four hundred twenty-one".