2181357712 has 20 divisors (see below), whose sum is σ = 4237722940. Its totient is φ = 1087751808.

The previous prime is 2181357691. The next prime is 2181357713. The reversal of 2181357712 is 2177531812.

It can be written as a sum of positive squares in 2 ways, for example, as 843553936 + 1337803776 = 29044^2 + 36576^2 .

It is not an unprimeable number, because it can be changed into a prime (2181357713) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 176787 + ... + 188722.

It is an arithmetic number, because the mean of its divisors is an integer number (211886147).

Almost surely, 2^2181357712 is an apocalyptic number.

It is an amenable number.

2181357712 is a deficient number, since it is larger than the sum of its proper divisors (2056365228).

2181357712 is a wasteful number, since it uses less digits than its factorization.

2181357712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 365890 (or 365884 counting only the distinct ones).

The product of its digits is 23520, while the sum is 37.

The square root of 2181357712 is about 46705.0073546724. The cubic root of 2181357712 is about 1296.9073847989.

The spelling of 2181357712 in words is "two billion, one hundred eighty-one million, three hundred fifty-seven thousand, seven hundred twelve".