2153512521 has 8 divisors (see below), whose sum is σ = 3190388960. Its totient is φ = 1435674996.

The previous prime is 2153512513. The next prime is 2153512547. The reversal of 2153512521 is 1252153512.

2153512521 is a `hidden beast` number, since 2 + 1 + 535 + 125 + 2 + 1 = 666.

2153512521 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 2153512521 - 2³ = 2153512513 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 79759723 = 2153512521 / (2 + 1 + 5 + 3 + 5 + 1 + 2 + 5 + 2 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2153512021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39879835 + ... + 39879888.

It is an arithmetic number, because the mean of its divisors is an integer number (398798620).

Almost surely, 2^2153512521 is an apocalyptic number.

It is an amenable number.

2153512521 is a deficient number, since it is larger than the sum of its proper divisors (1036876439).

2153512521 is an equidigital number, since it uses as much as digits as its factorization.

2153512521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79759732 (or 79759726 counting only the distinct ones).

The product of its digits is 3000, while the sum is 27.

The square root of 2153512521 is about 46405.9535081438. The cubic root of 2153512521 is about 1291.3653634464.

The spelling of 2153512521 in words is "two billion, one hundred fifty-three million, five hundred twelve thousand, five hundred twenty-one".