2177321 has 2 divisors, whose sum is σ = 2177322. Its totient is φ = 2177320.

The previous prime is 2177297. The next prime is 2177323. The reversal of 2177321 is 1237712.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1792921 + 384400 = 1339^2 + 620^2 .

It is a cyclic number.

It is not a de Polignac number, because 2177321 - 2¹⁴ = 2160937 is a prime.

Together with 2177323, 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 (2177323) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1088660 + 1088661.

It is an arithmetic number, because the mean of its divisors is an integer number (1088661).

2^2177321 is an apocalyptic number.

It is an amenable number.

2177321 is a deficient number, since it is larger than the sum of its proper divisors (1).

2177321 is an equidigital number, since it uses as much as digits as its factorization.

2177321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 588, while the sum is 23.

The square root of 2177321 is about 1475.5748032547. The cubic root of 2177321 is about 129.6106893396.

The spelling of 2177321 in words is "two million, one hundred seventy-seven thousand, three hundred twenty-one".