2181955344 has 40 divisors (see below), whose sum is σ = 5648076000. Its totient is φ = 725852928.

The previous prime is 2181955339. The next prime is 2181955387. The reversal of 2181955344 is 4435591812.

It is a junction number, because it is equal to n+sod(n) for n = 2181955296 and 2181955305.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21597 + ... + 69500.

It is an arithmetic number, because the mean of its divisors is an integer number (141201900).

Almost surely, 2^2181955344 is an apocalyptic number.

2181955344 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

2181955344 is an abundant number, since it is smaller than the sum of its proper divisors (3466120656).

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

2181955344 is a wasteful number, since it uses less digits than its factorization.

2181955344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91607 (or 91601 counting only the distinct ones).

The product of its digits is 172800, while the sum is 42.

The square root of 2181955344 is about 46711.4048600553. The cubic root of 2181955344 is about 1297.0258129652.

The spelling of 2181955344 in words is "two billion, one hundred eighty-one million, nine hundred fifty-five thousand, three hundred forty-four".