2181394468 has 48 divisors (see below), whose sum is σ = 4233096000. Its totient is φ = 975283200.

The previous prime is 2181394447. The next prime is 2181394477. The reversal of 2181394468 is 8644931812.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1602108 + ... + 1603468.

It is an arithmetic number, because the mean of its divisors is an integer number (88189500).

Almost surely, 2^2181394468 is an apocalyptic number.

It is an amenable number.

2181394468 is a deficient number, since it is larger than the sum of its proper divisors (2051701532).

2181394468 is a wasteful number, since it uses less digits than its factorization.

2181394468 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1948 (or 1946 counting only the distinct ones).

The product of its digits is 331776, while the sum is 46.

The square root of 2181394468 is about 46705.4008440137. The cubic root of 2181394468 is about 1296.9146690787.

It can be divided in two parts, 21813 and 94468, that added together give a square (116281 = 341²).

The spelling of 2181394468 in words is "two billion, one hundred eighty-one million, three hundred ninety-four thousand, four hundred sixty-eight".