2181243812 has 12 divisors (see below), whose sum is σ = 4164192816. Its totient is φ = 991474440.

The previous prime is 2181243791. The next prime is 2181243853. The reversal of 2181243812 is 2183421812.

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, 24786818 + ... + 24786905.

It is an arithmetic number, because the mean of its divisors is an integer number (347016068).

Almost surely, 2^2181243812 is an apocalyptic number.

2181243812 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

2181243812 is a deficient number, since it is larger than the sum of its proper divisors (1982949004).

2181243812 is a wasteful number, since it uses less digits than its factorization.

2181243812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49573738 (or 49573736 counting only the distinct ones).

The product of its digits is 6144, while the sum is 32.

The square root of 2181243812 is about 46703.7879834174. The cubic root of 2181243812 is about 1296.8848116523.

The spelling of 2181243812 in words is "two billion, one hundred eighty-one million, two hundred forty-three thousand, eight hundred twelve".