2100645888 has 104 divisors (see below), whose sum is σ = 6110617056. Its totient is φ = 636518400.

The previous prime is 2100645887. The next prime is 2100645889. The reversal of 2100645888 is 8885460012.

It is an interprime number because it is at equal distance from previous prime (2100645887) and next prime (2100645889).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2100645887) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 127398 + ... + 142938.

Almost surely, 2^2100645888 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2100645888, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3055308528).

2100645888 is an abundant number, since it is smaller than the sum of its proper divisors (4009971168).

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

2100645888 is a wasteful number, since it uses less digits than its factorization.

2100645888 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15579 (or 15557 counting only the distinct ones).

The product of its (nonzero) digits is 122880, while the sum is 42.

The square root of 2100645888 is about 45832.8036236057. The cubic root of 2100645888 is about 1280.7104389452.

The spelling of 2100645888 in words is "two billion, one hundred million, six hundred forty-five thousand, eight hundred eighty-eight".