2163023521 has 4 divisors (see below), whose sum is σ = 2163162544. Its totient is φ = 2162884500.

The previous prime is 2163023437. The next prime is 2163023531. The reversal of 2163023521 is 1253203612.

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 a cyclic number.

It is not a de Polignac number, because 2163023521 - 2¹¹ = 2163021473 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2163023531) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42735 + ... + 78436.

It is an arithmetic number, because the mean of its divisors is an integer number (540790636).

Almost surely, 2^2163023521 is an apocalyptic number.

It is an amenable number.

2163023521 is a deficient number, since it is larger than the sum of its proper divisors (139023).

2163023521 is a wasteful number, since it uses less digits than its factorization.

2163023521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139022.

The product of its (nonzero) digits is 2160, while the sum is 25.

The square root of 2163023521 is about 46508.3166863734. The cubic root of 2163023521 is about 1293.2636789742.

The spelling of 2163023521 in words is "two billion, one hundred sixty-three million, twenty-three thousand, five hundred twenty-one".