2181959842 has 8 divisors (see below), whose sum is σ = 3297924432. Its totient is φ = 1082651700.

The previous prime is 2181959803. The next prime is 2181959849. The reversal of 2181959842 is 2489591812.

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

It is not an unprimeable number, because it can be changed into a prime (2181959849) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4163784 + ... + 4164307.

It is an arithmetic number, because the mean of its divisors is an integer number (412240554).

Almost surely, 2^2181959842 is an apocalyptic number.

2181959842 is a deficient number, since it is larger than the sum of its proper divisors (1115964590).

2181959842 is a wasteful number, since it uses less digits than its factorization.

2181959842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8328224.

The product of its digits is 414720, while the sum is 49.

The square root of 2181959842 is about 46711.4530067306. The cubic root of 2181959842 is about 1297.0267042175.

The spelling of 2181959842 in words is "two billion, one hundred eighty-one million, nine hundred fifty-nine thousand, eight hundred forty-two".