2100557556 has 24 divisors (see below), whose sum is σ = 5445890240. Its totient is φ = 700185816.

The previous prime is 2100557513. The next prime is 2100557561. The reversal of 2100557556 is 6557550012.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 2100557556.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9724696 + ... + 9724911.

Almost surely, 2^2100557556 is an apocalyptic number.

It is an amenable number.

2100557556 is an abundant number, since it is smaller than the sum of its proper divisors (3345332684).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2100557556 is a wasteful number, since it uses less digits than its factorization.

2100557556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19449620 (or 19449612 counting only the distinct ones).

The product of its (nonzero) digits is 52500, while the sum is 36.

The square root of 2100557556 is about 45831.8399805201. The cubic root of 2100557556 is about 1280.6924874346.

The spelling of 2100557556 in words is "two billion, one hundred million, five hundred fifty-seven thousand, five hundred fifty-six".