2162021621 has 2 divisors, whose sum is σ = 2162021622. Its totient is φ = 2162021620.

The previous prime is 2162021581. The next prime is 2162021669. The reversal of 2162021621 is 1261202612.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1467962596 + 694059025 = 38314^2 + 26345^2 .

It is a cyclic number.

It is not a de Polignac number, because 2162021621 - 2⁶ = 2162021557 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2162021681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1081010810 + 1081010811.

It is an arithmetic number, because the mean of its divisors is an integer number (1081010811).

Almost surely, 2^2162021621 is an apocalyptic number.

It is an amenable number.

2162021621 is a deficient number, since it is larger than the sum of its proper divisors (1).

2162021621 is an equidigital number, since it uses as much as digits as its factorization.

2162021621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 2162021621 is about 46497.5442469815. The cubic root of 2162021621 is about 1293.0639707146.

The spelling of 2162021621 in words is "two billion, one hundred sixty-two million, twenty-one thousand, six hundred twenty-one".