2105661200 has 60 divisors (see below), whose sum is σ = 5130171648. Its totient is φ = 830390400.

The previous prime is 2105661163. The next prime is 2105661209. The reversal of 2105661200 is 21665012.

It is not an unprimeable number, because it can be changed into a prime (2105661209) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8672 + ... + 65471.

Almost surely, 2^2105661200 is an apocalyptic number.

2105661200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2105661200 is an abundant number, since it is smaller than the sum of its proper divisors (3024510448).

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

2105661200 is a wasteful number, since it uses less digits than its factorization.

2105661200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74232 (or 74221 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 2105661200 is about 45887.4841323863. The cubic root of 2105661200 is about 1281.7288649845.

The spelling of 2105661200 in words is "two billion, one hundred five million, six hundred sixty-one thousand, two hundred".