2189210521 has 9 divisors (see below), whose sum is σ = 2223853333. Its totient is φ = 2155101340.

The previous prime is 2189210503. The next prime is 2189210549. The reversal of 2189210521 is 1250129812.

The square root of 2189210521 is 46789.

It is a perfect power (a square), and thus also a powerful number.

2189210521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 2189210521 - 2⁷ = 2189210393 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2189280521) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 3321690 + ... + 3322348.

Almost surely, 2^2189210521 is an apocalyptic number.

2189210521 is the 46789-th square number.

2189210521 is the 23395-th centered octagonal number.

It is an amenable number.

2189210521 is a deficient number, since it is larger than the sum of its proper divisors (34642812).

2189210521 is an frugal number, since it uses more digits than its factorization.

2189210521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1460 (or 730 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 31.

The cubic root of 2189210521 is about 1298.4617942682.

The spelling of 2189210521 in words is "two billion, one hundred eighty-nine million, two hundred ten thousand, five hundred twenty-one".