2100661104 has 40 divisors (see below), whose sum is σ = 5479407232. Its totient is φ = 693420480.

The previous prime is 2100661097. The next prime is 2100661177. The reversal of 2100661104 is 4011660012.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 207502 + ... + 217389.

Almost surely, 2^2100661104 is an apocalyptic number.

2100661104 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

2100661104 is an abundant number, since it is smaller than the sum of its proper divisors (3378746128).

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

2100661104 is a wasteful number, since it uses less digits than its factorization.

2100661104 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 425005 (or 424999 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 21.

The square root of 2100661104 is about 45832.9696179508. The cubic root of 2100661104 is about 1280.7135312072.

The spelling of 2100661104 in words is "two billion, one hundred million, six hundred sixty-one thousand, one hundred four".