2173928321 has 2 divisors, whose sum is σ = 2173928322. Its totient is φ = 2173928320.

The previous prime is 2173928279. The next prime is 2173928353. The reversal of 2173928321 is 1238293712.

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., 1357111921 + 816816400 = 36839^2 + 28580^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2173928321 is a prime.

It is not a weakly prime, because it can be changed into another prime (2173928371) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1086964160 + 1086964161.

It is an arithmetic number, because the mean of its divisors is an integer number (1086964161).

Almost surely, 2^2173928321 is an apocalyptic number.

It is an amenable number.

2173928321 is a deficient number, since it is larger than the sum of its proper divisors (1).

2173928321 is an equidigital number, since it uses as much as digits as its factorization.

2173928321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 36288, while the sum is 38.

The square root of 2173928321 is about 46625.4042448964. The cubic root of 2173928321 is about 1295.4333499989.

The spelling of 2173928321 in words is "two billion, one hundred seventy-three million, nine hundred twenty-eight thousand, three hundred twenty-one".