2163087921 has 4 divisors (see below), whose sum is σ = 2884117232. Its totient is φ = 1442058612.

The previous prime is 2163087907. The next prime is 2163087929. The reversal of 2163087921 is 1297803612.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 2163087921 - 2²⁹ = 1626217009 is a prime.

It is a super-2 number, since 2×2163087921² = 9357898707952204482, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2163087921.

It is not an unprimeable number, because it can be changed into a prime (2163087929) 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 in 3 ways as a sum of consecutive naturals, for example, 360514651 + ... + 360514656.

It is an arithmetic number, because the mean of its divisors is an integer number (721029308).

Almost surely, 2^2163087921 is an apocalyptic number.

It is an amenable number.

2163087921 is a deficient number, since it is larger than the sum of its proper divisors (721029311).

2163087921 is an equidigital number, since it uses as much as digits as its factorization.

2163087921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 721029310.

The product of its (nonzero) digits is 36288, while the sum is 39.

The square root of 2163087921 is about 46509.0090305093. The cubic root of 2163087921 is about 1293.2765136866.

The spelling of 2163087921 in words is "two billion, one hundred sixty-three million, eighty-seven thousand, nine hundred twenty-one".