2153544521 has 4 divisors (see below), whose sum is σ = 2160559632. Its totient is φ = 2146529412.

The previous prime is 2153544517. The next prime is 2153544529. The reversal of 2153544521 is 1254453512.

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 2153544521 - 2² = 2153544517 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2153544529) 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, 3507095 + ... + 3507708.

It is an arithmetic number, because the mean of its divisors is an integer number (540139908).

Almost surely, 2^2153544521 is an apocalyptic number.

It is an amenable number.

2153544521 is a deficient number, since it is larger than the sum of its proper divisors (7015111).

2153544521 is an equidigital number, since it uses as much as digits as its factorization.

2153544521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7015110.

The product of its digits is 24000, while the sum is 32.

The square root of 2153544521 is about 46406.2982902106. The cubic root of 2153544521 is about 1291.3717597388.

The spelling of 2153544521 in words is "two billion, one hundred fifty-three million, five hundred forty-four thousand, five hundred twenty-one".