2153572221 has 4 divisors (see below), whose sum is σ = 2871429632. Its totient is φ = 1435714812.

The previous prime is 2153572217. The next prime is 2153572237. The reversal of 2153572221 is 1222753512.

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 2153572221 - 2² = 2153572217 is a prime.

It is a super-2 number, since 2×2153572221² = 9275746622125745682, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2153572241) 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 in 3 ways as a sum of consecutive naturals, for example, 358928701 + ... + 358928706.

It is an arithmetic number, because the mean of its divisors is an integer number (717857408).

Almost surely, 2^2153572221 is an apocalyptic number.

It is an amenable number.

2153572221 is a deficient number, since it is larger than the sum of its proper divisors (717857411).

2153572221 is an equidigital number, since it uses as much as digits as its factorization.

2153572221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 717857410.

The product of its digits is 8400, while the sum is 30.

The square root of 2153572221 is about 46406.5967401187. The cubic root of 2153572221 is about 1291.3772964782.

The spelling of 2153572221 in words is "two billion, one hundred fifty-three million, five hundred seventy-two thousand, two hundred twenty-one".