2161218715 has 8 divisors (see below), whose sum is σ = 2635978608. Its totient is φ = 1700630880.

The previous prime is 2161218679. The next prime is 2161218727. The reversal of 2161218715 is 5178121612.

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

It is not a de Polignac number, because 2161218715 - 2¹⁹ = 2160694427 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3542677 + ... + 3543286.

It is an arithmetic number, because the mean of its divisors is an integer number (329497326).

Almost surely, 2^2161218715 is an apocalyptic number.

2161218715 is a deficient number, since it is larger than the sum of its proper divisors (474759893).

2161218715 is an equidigital number, since it uses as much as digits as its factorization.

2161218715 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7086029.

The product of its digits is 6720, while the sum is 34.

The square root of 2161218715 is about 46488.9095914284. The cubic root of 2161218715 is about 1292.9038832983.

The spelling of 2161218715 in words is "two billion, one hundred sixty-one million, two hundred eighteen thousand, seven hundred fifteen".