2181344263 has 8 divisors (see below), whose sum is σ = 2500932128. Its totient is φ = 1863748224.

The previous prime is 2181344251. The next prime is 2181344281. The reversal of 2181344263 is 3624431812.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2181344263 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2181344293) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 495606 + ... + 499987.

It is an arithmetic number, because the mean of its divisors is an integer number (312616516).

Almost surely, 2^2181344263 is an apocalyptic number.

2181344263 is a deficient number, since it is larger than the sum of its proper divisors (319587865).

2181344263 is an equidigital number, since it uses as much as digits as its factorization.

2181344263 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 995913.

The product of its digits is 27648, while the sum is 34.

The square root of 2181344263 is about 46704.8633763123. The cubic root of 2181344263 is about 1296.9047194645.

The spelling of 2181344263 in words is "two billion, one hundred eighty-one million, three hundred forty-four thousand, two hundred sixty-three".