4323139721 has 2 divisors, whose sum is σ = 4323139722. Its totient is φ = 4323139720.

The previous prime is 4323139703. The next prime is 4323139741. The reversal of 4323139721 is 1279313234.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2849424400 + 1473715321 = 53380^2 + 38389^2 .

It is a cyclic number.

It is not a de Polignac number, because 4323139721 - 2⁶ = 4323139657 is a prime.

It is not a weakly prime, because it can be changed into another prime (4323139741) 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, 2161569860 + 2161569861.

It is an arithmetic number, because the mean of its divisors is an integer number (2161569861).

Almost surely, 2^4323139721 is an apocalyptic number.

It is an amenable number.

4323139721 is a deficient number, since it is larger than the sum of its proper divisors (1).

4323139721 is an equidigital number, since it uses as much as digits as its factorization.

4323139721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 27216, while the sum is 35.

The square root of 4323139721 is about 65750.5872293168. The cubic root of 4323139721 is about 1629.0450352413.

The spelling of 4323139721 in words is "four billion, three hundred twenty-three million, one hundred thirty-nine thousand, seven hundred twenty-one".