312221222329 has 2 divisors, whose sum is σ = 312221222330. Its totient is φ = 312221222328.

The previous prime is 312221222317. The next prime is 312221222353. The reversal of 312221222329 is 923222122213.

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., 286931635600 + 25289586729 = 535660^2 + 159027^2 .

It is a cyclic number.

It is not a de Polignac number, because 312221222329 - 2⁹ = 312221221817 is a prime.

It is a super-2 number, since 2×312221222329² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 312221222329.

It is not a weakly prime, because it can be changed into another prime (312221202329) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 156110611164 + 156110611165.

It is an arithmetic number, because the mean of its divisors is an integer number (156110611165).

Almost surely, 2^312221222329 is an apocalyptic number.

It is an amenable number.

312221222329 is a deficient number, since it is larger than the sum of its proper divisors (1).

312221222329 is an equidigital number, since it uses as much as digits as its factorization.

312221222329 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10368, while the sum is 31.

The spelling of 312221222329 in words is "three hundred twelve billion, two hundred twenty-one million, two hundred twenty-two thousand, three hundred twenty-nine".