222321391 has 2 divisors, whose sum is σ = 222321392. Its totient is φ = 222321390.

The previous prime is 222321389. The next prime is 222321397. The reversal of 222321391 is 193123222.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 222321391 - 2¹ = 222321389 is a prime.

Together with 222321389, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (222321397) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 111160695 + 111160696.

It is an arithmetic number, because the mean of its divisors is an integer number (111160696).

Almost surely, 2^222321391 is an apocalyptic number.

222321391 is a deficient number, since it is larger than the sum of its proper divisors (1).

222321391 is an equidigital number, since it uses as much as digits as its factorization.

222321391 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1296, while the sum is 25.

The square root of 222321391 is about 14910.4457009172. The cubic root of 222321391 is about 605.7969516921.

The spelling of 222321391 in words is "two hundred twenty-two million, three hundred twenty-one thousand, three hundred ninety-one".