2557110221 has 4 divisors (see below), whose sum is σ = 2557328700. Its totient is φ = 2556891744.

The previous prime is 2557110187. The next prime is 2557110253. The reversal of 2557110221 is 1220117552.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 156600196 + 2400510025 = 12514^2 + 48995^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2557110221 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2557110271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 90626 + ... + 115443.

It is an arithmetic number, because the mean of its divisors is an integer number (639332175).

Almost surely, 2^2557110221 is an apocalyptic number.

It is an amenable number.

2557110221 is a deficient number, since it is larger than the sum of its proper divisors (218479).

2557110221 is a wasteful number, since it uses less digits than its factorization.

2557110221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 218478.

The product of its (nonzero) digits is 1400, while the sum is 26.

The square root of 2557110221 is about 50567.8773630059. The cubic root of 2557110221 is about 1367.4658288950.

Adding to 2557110221 its reverse (1220117552), we get a palindrome (3777227773).

The spelling of 2557110221 in words is "two billion, five hundred fifty-seven million, one hundred ten thousand, two hundred twenty-one".