321696121 has 2 divisors, whose sum is σ = 321696122. Its totient is φ = 321696120.

The previous prime is 321696113. The next prime is 321696149. The reversal of 321696121 is 121696123.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 304014096 + 17682025 = 17436^2 + 4205^2 .

It is an emirp because it is prime and its reverse (121696123) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 321696121 - 2³ = 321696113 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is not a weakly prime, because it can be changed into another prime (321696521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160848060 + 160848061.

It is an arithmetic number, because the mean of its divisors is an integer number (160848061).

Almost surely, 2^321696121 is an apocalyptic number.

It is an amenable number.

321696121 is a deficient number, since it is larger than the sum of its proper divisors (1).

321696121 is an equidigital number, since it uses as much as digits as its factorization.

321696121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3888, while the sum is 31.

The square root of 321696121 is about 17935.8891889976. The cubic root of 321696121 is about 685.1967190347.

The spelling of 321696121 in words is "three hundred twenty-one million, six hundred ninety-six thousand, one hundred twenty-one".