2181344247 has 6 divisors (see below), whose sum is σ = 3150830592. Its totient is φ = 1454229492.

The previous prime is 2181344237. The next prime is 2181344251. The reversal of 2181344247 is 7424431812.

2181344247 is a `hidden beast` number, since 218 + 13 + 4 + 424 + 7 = 666.

It is not a de Polignac number, because 2181344247 - 2⁶ = 2181344183 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2181344237) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 121185783 + ... + 121185800.

It is an arithmetic number, because the mean of its divisors is an integer number (525138432).

Almost surely, 2^2181344247 is an apocalyptic number.

2181344247 is a deficient number, since it is larger than the sum of its proper divisors (969486345).

2181344247 is a wasteful number, since it uses less digits than its factorization.

2181344247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 242371589 (or 242371586 counting only the distinct ones).

The product of its digits is 43008, while the sum is 36.

The square root of 2181344247 is about 46704.8632050239. The cubic root of 2181344247 is about 1296.9047162936.

The spelling of 2181344247 in words is "two billion, one hundred eighty-one million, three hundred forty-four thousand, two hundred forty-seven".