312212132321 has 2 divisors, whose sum is σ = 312212132322. Its totient is φ = 312212132320.

The previous prime is 312212132279. The next prime is 312212132347. The reversal of 312212132321 is 123231212213.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 164621701696 + 147590430625 = 405736^2 + 384175^2 .

It is a cyclic number.

It is not a de Polignac number, because 312212132321 - 2¹⁸ = 312211870177 is a prime.

It is a super-2 number, since 2×312212132321² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (312212432321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 156106066160 + 156106066161.

It is an arithmetic number, because the mean of its divisors is an integer number (156106066161).

Almost surely, 2^312212132321 is an apocalyptic number.

It is an amenable number.

312212132321 is a deficient number, since it is larger than the sum of its proper divisors (1).

312212132321 is an equidigital number, since it uses as much as digits as its factorization.

312212132321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 864, while the sum is 23.

Adding to 312212132321 its reverse (123231212213), we get a palindrome (435443344534).

The spelling of 312212132321 in words is "three hundred twelve billion, two hundred twelve million, one hundred thirty-two thousand, three hundred twenty-one".