2100242557 has 6 divisors (see below), whose sum is σ = 2443139358. Its totient is φ = 1800207864.

The previous prime is 2100242513. The next prime is 2100242587. The reversal of 2100242557 is 7552420012.

It can be written as a sum of positive squares in only one way, i.e., 1715533561 + 384708996 = 41419^2 + 19614^2 .

It is not a de Polignac number, because 2100242557 - 2⁷ = 2100242429 is a prime.

It is a super-3 number, since 3×2100242557³ (a number of 29 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2100242587) 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 in 5 ways as a sum of consecutive naturals, for example, 21430998 + ... + 21431095.

It is an arithmetic number, because the mean of its divisors is an integer number (407189893).

Almost surely, 2^2100242557 is an apocalyptic number.

It is an amenable number.

2100242557 is a deficient number, since it is larger than the sum of its proper divisors (342896801).

2100242557 is an equidigital number, since it uses as much as digits as its factorization.

2100242557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42862107 (or 42862100 counting only the distinct ones).

The product of its (nonzero) digits is 5600, while the sum is 28.

The square root of 2100242557 is about 45828.4033869826. The cubic root of 2100242557 is about 1280.6284668101.

Adding to 2100242557 its reverse (7552420012), we get a palindrome (9652662569).

The spelling of 2100242557 in words is "two billion, one hundred million, two hundred forty-two thousand, five hundred fifty-seven".