2181811424 has 24 divisors (see below), whose sum is σ = 4625860680. Its totient is φ = 1006989696.

The previous prime is 2181811381. The next prime is 2181811453. The reversal of 2181811424 is 4241181812.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2621954 + ... + 2622785.

It is an arithmetic number, because the mean of its divisors is an integer number (192744195).

Almost surely, 2^2181811424 is an apocalyptic number.

It is an amenable number.

2181811424 is an abundant number, since it is smaller than the sum of its proper divisors (2444049256).

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

2181811424 is a wasteful number, since it uses less digits than its factorization.

2181811424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5244762 (or 5244754 counting only the distinct ones).

The product of its digits is 4096, while the sum is 32.

The square root of 2181811424 is about 46709.8643115135. The cubic root of 2181811424 is about 1296.9972954156.

The spelling of 2181811424 in words is "two billion, one hundred eighty-one million, eight hundred eleven thousand, four hundred twenty-four".