321121091 has 2 divisors, whose sum is σ = 321121092. Its totient is φ = 321121090.

The previous prime is 321121067. The next prime is 321121093. The reversal of 321121091 is 190121123.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 321121091 - 2²² = 316926787 is a prime.

Together with 321121093, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (321121093) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160560545 + 160560546.

It is an arithmetic number, because the mean of its divisors is an integer number (160560546).

Almost surely, 2^321121091 is an apocalyptic number.

321121091 is a deficient number, since it is larger than the sum of its proper divisors (1).

321121091 is an equidigital number, since it uses as much as digits as its factorization.

321121091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108, while the sum is 20.

The square root of 321121091 is about 17919.8518688074. The cubic root of 321121091 is about 684.7882137821.

The spelling of 321121091 in words is "three hundred twenty-one million, one hundred twenty-one thousand, ninety-one".