321102157 has 2 divisors, whose sum is σ = 321102158. Its totient is φ = 321102156.

The previous prime is 321102097. The next prime is 321102161. The reversal of 321102157 is 751201123.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 185123236 + 135978921 = 13606^2 + 11661^2 .

It is a cyclic number.

It is not a de Polignac number, because 321102157 - 2²³ = 312713549 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (321105157) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160551078 + 160551079.

It is an arithmetic number, because the mean of its divisors is an integer number (160551079).

Almost surely, 2^321102157 is an apocalyptic number.

It is an amenable number.

321102157 is a deficient number, since it is larger than the sum of its proper divisors (1).

321102157 is an equidigital number, since it uses as much as digits as its factorization.

321102157 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 420, while the sum is 22.

The square root of 321102157 is about 17919.3235642420. The cubic root of 321102157 is about 684.7747546487.

The spelling of 321102157 in words is "three hundred twenty-one million, one hundred two thousand, one hundred fifty-seven".