2153625621 has 8 divisors (see below), whose sum is σ = 3281715264. Its totient is φ = 1230643200.

The previous prime is 2153625581. The next prime is 2153625629. The reversal of 2153625621 is 1265263512.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2153625621 - 2⁹ = 2153625109 is a prime.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2153625629) 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 7 ways as a sum of consecutive naturals, for example, 51276780 + ... + 51276821.

It is an arithmetic number, because the mean of its divisors is an integer number (410214408).

Almost surely, 2^2153625621 is an apocalyptic number.

2153625621 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

2153625621 is a deficient number, since it is larger than the sum of its proper divisors (1128089643).

2153625621 is a wasteful number, since it uses less digits than its factorization.

2153625621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102553611.

The product of its digits is 21600, while the sum is 33.

The square root of 2153625621 is about 46407.1720857886. The cubic root of 2153625621 is about 1291.3879700584.

The spelling of 2153625621 in words is "two billion, one hundred fifty-three million, six hundred twenty-five thousand, six hundred twenty-one".