2117321 has 2 divisors, whose sum is σ = 2117322. Its totient is φ = 2117320.

The previous prime is 2117317. The next prime is 2117351. The reversal of 2117321 is 1237112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2062096 + 55225 = 1436^2 + 235^2 .

It is a cyclic number.

It is not a de Polignac number, because 2117321 - 2² = 2117317 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2117321.

It is not a weakly prime, because it can be changed into another prime (2117351) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1058660 + 1058661.

It is an arithmetic number, because the mean of its divisors is an integer number (1058661).

2^2117321 is an apocalyptic number.

It is an amenable number.

2117321 is a deficient number, since it is larger than the sum of its proper divisors (1).

2117321 is an equidigital number, since it uses as much as digits as its factorization.

2117321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 84, while the sum is 17.

The square root of 2117321 is about 1455.1017146578. The cubic root of 2117321 is about 128.4090308830.

The spelling of 2117321 in words is "two million, one hundred seventeen thousand, three hundred twenty-one".