2557052221 has 2 divisors, whose sum is σ = 2557052222. Its totient is φ = 2557052220.

The previous prime is 2557052159. The next prime is 2557052269. The reversal of 2557052221 is 1222507552.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1999431225 + 557620996 = 44715^2 + 23614^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2557052221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2557052021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1278526110 + 1278526111.

It is an arithmetic number, because the mean of its divisors is an integer number (1278526111).

Almost surely, 2^2557052221 is an apocalyptic number.

It is an amenable number.

2557052221 is a deficient number, since it is larger than the sum of its proper divisors (1).

2557052221 is an equidigital number, since it uses as much as digits as its factorization.

2557052221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 14000, while the sum is 31.

The square root of 2557052221 is about 50567.3038731550. The cubic root of 2557052221 is about 1367.4554899302.

Adding to 2557052221 its reverse (1222507552), we get a palindrome (3779559773).

The spelling of 2557052221 in words is "two billion, five hundred fifty-seven million, fifty-two thousand, two hundred twenty-one".