2101115557 has 2 divisors, whose sum is σ = 2101115558. Its totient is φ = 2101115556.

The previous prime is 2101115543. The next prime is 2101115581. The reversal of 2101115557 is 7555111012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1717190721 + 383924836 = 41439^2 + 19594^2 .

It is a cyclic number.

It is not a de Polignac number, because 2101115557 - 2²³ = 2092726949 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2101115587) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1050557778 + 1050557779.

It is an arithmetic number, because the mean of its divisors is an integer number (1050557779).

Almost surely, 2^2101115557 is an apocalyptic number.

It is an amenable number.

2101115557 is a deficient number, since it is larger than the sum of its proper divisors (1).

2101115557 is an equidigital number, since it uses as much as digits as its factorization.

2101115557 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1750, while the sum is 28.

The square root of 2101115557 is about 45837.9270582778. The cubic root of 2101115557 is about 1280.8058802522.

Adding to 2101115557 its reverse (7555111012), we get a palindrome (9656226569).

The spelling of 2101115557 in words is "two billion, one hundred one million, one hundred fifteen thousand, five hundred fifty-seven".