2557203521 has 12 divisors (see below), whose sum is σ = 2730342000. Its totient is φ = 2388403080.

The previous prime is 2557203511. The next prime is 2557203527. The reversal of 2557203521 is 1253027552.

It is not a de Polignac number, because 2557203521 - 2¹⁸ = 2556941377 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2557203527) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 82430 + ... + 109128.

It is an arithmetic number, because the mean of its divisors is an integer number (227528500).

Almost surely, 2^2557203521 is an apocalyptic number.

It is an amenable number.

2557203521 is a deficient number, since it is larger than the sum of its proper divisors (173138479).

2557203521 is an equidigital number, since it uses as much as digits as its factorization.

2557203521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26860 (or 26789 counting only the distinct ones).

The product of its (nonzero) digits is 21000, while the sum is 32.

The square root of 2557203521 is about 50568.7998769993. The cubic root of 2557203521 is about 1367.4824600397.

The spelling of 2557203521 in words is "two billion, five hundred fifty-seven million, two hundred three thousand, five hundred twenty-one".