312002221 has 2 divisors, whose sum is σ = 312002222. Its totient is φ = 312002220.

The previous prime is 312002209. The next prime is 312002237. The reversal of 312002221 is 122200213.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 240684196 + 71318025 = 15514^2 + 8445^2 .

It is a cyclic number.

It is not a de Polignac number, because 312002221 - 2²¹ = 309905069 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (312062221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 156001110 + 156001111.

It is an arithmetic number, because the mean of its divisors is an integer number (156001111).

Almost surely, 2^312002221 is an apocalyptic number.

It is an amenable number.

312002221 is a deficient number, since it is larger than the sum of its proper divisors (1).

312002221 is an equidigital number, since it uses as much as digits as its factorization.

312002221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 312002221 is about 17663.5846022261. The cubic root of 312002221 is about 678.2438979752.

Adding to 312002221 its reverse (122200213), we get a palindrome (434202434).

The spelling of 312002221 in words is "three hundred twelve million, two thousand, two hundred twenty-one".