2172277321 has 2 divisors, whose sum is σ = 2172277322. Its totient is φ = 2172277320.

The previous prime is 2172277319. The next prime is 2172277351. The reversal of 2172277321 is 1237722712.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2170534921 + 1742400 = 46589^2 + 1320^2 .

It is a cyclic number.

It is not a de Polignac number, because 2172277321 - 2¹ = 2172277319 is a prime.

Together with 2172277319, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (2172277351) 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, 1086138660 + 1086138661.

It is an arithmetic number, because the mean of its divisors is an integer number (1086138661).

Almost surely, 2^2172277321 is an apocalyptic number.

It is an amenable number.

2172277321 is a deficient number, since it is larger than the sum of its proper divisors (1).

2172277321 is an equidigital number, since it uses as much as digits as its factorization.

2172277321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16464, while the sum is 34.

The square root of 2172277321 is about 46607.6959417648. The cubic root of 2172277321 is about 1295.1053259791.

The spelling of 2172277321 in words is "two billion, one hundred seventy-two million, two hundred seventy-seven thousand, three hundred twenty-one".