2181323217 has 8 divisors (see below), whose sum is σ = 2956110400. Its totient is φ = 1430375760.

The previous prime is 2181323203. The next prime is 2181323237. The reversal of 2181323217 is 7123231812.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2181323217 - 2¹⁰ = 2181322193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2181323237) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 5959717 + ... + 5960082.

It is an arithmetic number, because the mean of its divisors is an integer number (369513800).

Almost surely, 2^2181323217 is an apocalyptic number.

It is an amenable number.

2181323217 is a deficient number, since it is larger than the sum of its proper divisors (774787183).

2181323217 is a wasteful number, since it uses less digits than its factorization.

2181323217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11919863.

The product of its digits is 4032, while the sum is 30.

The square root of 2181323217 is about 46704.6380673269. The cubic root of 2181323217 is about 1296.9005485281.

The spelling of 2181323217 in words is "two billion, one hundred eighty-one million, three hundred twenty-three thousand, two hundred seventeen".