2183215621 has 2 divisors, whose sum is σ = 2183215622. Its totient is φ = 2183215620.

The previous prime is 2183215603. The next prime is 2183215627. The reversal of 2183215621 is 1265123812.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1655594721 + 527620900 = 40689^2 + 22970^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2183215621 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2183215627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1091607810 + 1091607811.

It is an arithmetic number, because the mean of its divisors is an integer number (1091607811).

Almost surely, 2^2183215621 is an apocalyptic number.

It is an amenable number.

2183215621 is a deficient number, since it is larger than the sum of its proper divisors (1).

2183215621 is an equidigital number, since it uses as much as digits as its factorization.

2183215621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5760, while the sum is 31.

The square root of 2183215621 is about 46724.8929479780. The cubic root of 2183215621 is about 1297.2754815624.

The spelling of 2183215621 in words is "two billion, one hundred eighty-three million, two hundred fifteen thousand, six hundred twenty-one".