2181113720 has 16 divisors (see below), whose sum is σ = 4907505960. Its totient is φ = 872445472.

The previous prime is 2181113707. The next prime is 2181113731. The reversal of 2181113720 is 273111812.

It is a self number, because there is not a number n which added to its sum of digits gives 2181113720.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27263882 + ... + 27263961.

Almost surely, 2^2181113720 is an apocalyptic number.

2181113720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2181113720 is an abundant number, since it is smaller than the sum of its proper divisors (2726392240).

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

2181113720 is a wasteful number, since it uses less digits than its factorization.

2181113720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54527854 (or 54527850 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 26.

The square root of 2181113720 is about 46702.3952276540. The cubic root of 2181113720 is about 1296.8590285506.

The spelling of 2181113720 in words is "two billion, one hundred eighty-one million, one hundred thirteen thousand, seven hundred twenty".