2181823733 has 16 divisors (see below), whose sum is σ = 2313178560. Its totient is φ = 2055081600.

The previous prime is 2181823703. The next prime is 2181823747. The reversal of 2181823733 is 3373281812.

It is a cyclic number.

It is not a de Polignac number, because 2181823733 - 2⁶ = 2181823669 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 (2181823703) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 193238 + ... + 204216.

It is an arithmetic number, because the mean of its divisors is an integer number (144573660).

Almost surely, 2^2181823733 is an apocalyptic number.

It is an amenable number.

2181823733 is a deficient number, since it is larger than the sum of its proper divisors (131354827).

2181823733 is a wasteful number, since it uses less digits than its factorization.

2181823733 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11188.

The product of its digits is 48384, while the sum is 38.

The square root of 2181823733 is about 46709.9960715049. The cubic root of 2181823733 is about 1296.9997344761. Note that the first 3 decimals are identical.

The spelling of 2181823733 in words is "two billion, one hundred eighty-one million, eight hundred twenty-three thousand, seven hundred thirty-three".