2557528021 has 2 divisors, whose sum is σ = 2557528022. Its totient is φ = 2557528020.

The previous prime is 2557527997. The next prime is 2557528069. The reversal of 2557528021 is 1208257552.

2557528021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1581652900 + 975875121 = 39770^2 + 31239^2 .

It is a cyclic number.

It is not a de Polignac number, because 2557528021 - 2⁵ = 2557527989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2557558021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1278764010 + 1278764011.

It is an arithmetic number, because the mean of its divisors is an integer number (1278764011).

Almost surely, 2^2557528021 is an apocalyptic number.

It is an amenable number.

2557528021 is a deficient number, since it is larger than the sum of its proper divisors (1).

2557528021 is an equidigital number, since it uses as much as digits as its factorization.

2557528021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 56000, while the sum is 37.

The square root of 2557528021 is about 50572.0082753295. The cubic root of 2557528021 is about 1367.5403004744.

The spelling of 2557528021 in words is "two billion, five hundred fifty-seven million, five hundred twenty-eight thousand, twenty-one".