2151937218 has 8 divisors (see below), whose sum is σ = 4303874448. Its totient is φ = 717312404.

The previous prime is 2151937213. The next prime is 2151937219. The reversal of 2151937218 is 8127391512.

It is a happy number.

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

2151937218 is an admirable number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2151937213) 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, 179328096 + ... + 179328107.

It is an arithmetic number, because the mean of its divisors is an integer number (537984306).

Almost surely, 2^2151937218 is an apocalyptic number.

2151937218 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2151937218 is a wasteful number, since it uses less digits than its factorization.

2151937218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 358656208.

The product of its digits is 30240, while the sum is 39.

The square root of 2151937218 is about 46388.9773329829. The cubic root of 2151937218 is about 1291.0504069983.

The spelling of 2151937218 in words is "two billion, one hundred fifty-one million, nine hundred thirty-seven thousand, two hundred eighteen".