2101909572 has 36 divisors (see below), whose sum is σ = 6072183936. Its totient is φ = 600545520.

The previous prime is 2101909571. The next prime is 2101909591. The reversal of 2101909572 is 2759091012.

It is a tau number, because it is divible by the number of its divisors (36).

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

It is not an unprimeable number, because it can be changed into a prime (2101909571) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4170204 + ... + 4170707.

It is an arithmetic number, because the mean of its divisors is an integer number (168671776).

Almost surely, 2^2101909572 is an apocalyptic number.

It is an amenable number.

2101909572 is an abundant number, since it is smaller than the sum of its proper divisors (3970274364).

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

2101909572 is a wasteful number, since it uses less digits than its factorization.

2101909572 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8340928 (or 8340923 counting only the distinct ones).

The product of its (nonzero) digits is 11340, while the sum is 36.

The square root of 2101909572 is about 45846.5873539133. The cubic root of 2101909572 is about 1280.9671994775.

The spelling of 2101909572 in words is "two billion, one hundred one million, nine hundred nine thousand, five hundred seventy-two".