2162380721 has 2 divisors, whose sum is σ = 2162380722. Its totient is φ = 2162380720.

The previous prime is 2162380691. The next prime is 2162380733. The reversal of 2162380721 is 1270832612.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1542918400 + 619462321 = 39280^2 + 24889^2 .

It is a cyclic number.

It is not a de Polignac number, because 2162380721 - 2³⁰ = 1088638897 is a prime.

It is a super-3 number, since 3×2162380721³ (a number of 29 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (2162380741) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1081190360 + 1081190361.

It is an arithmetic number, because the mean of its divisors is an integer number (1081190361).

Almost surely, 2^2162380721 is an apocalyptic number.

It is an amenable number.

2162380721 is a deficient number, since it is larger than the sum of its proper divisors (1).

2162380721 is an equidigital number, since it uses as much as digits as its factorization.

2162380721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8064, while the sum is 32.

The square root of 2162380721 is about 46501.4055809069. The cubic root of 2162380721 is about 1293.1355570426.

The spelling of 2162380721 in words is "two billion, one hundred sixty-two million, three hundred eighty thousand, seven hundred twenty-one".