8121221218 has 32 divisors (see below), whose sum is σ = 13726268928. Its totient is φ = 3570220800.

The previous prime is 8121221201. The next prime is 8121221233.

8121221218 is nontrivially palindromic in base 10.

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, 1741546 + ... + 1746202.

It is an arithmetic number, because the mean of its divisors is an integer number (428945904).

Almost surely, 2^8121221218 is an apocalyptic number.

8121221218 is a deficient number, since it is larger than the sum of its proper divisors (5605047710).

8121221218 is a wasteful number, since it uses less digits than its factorization.

8121221218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7258.

The product of its digits is 1024, while the sum is 28.

The square root of 8121221218 is about 90117.8185377343. The cubic root of 8121221218 is about 2010.0511705330.

The spelling of 8121221218 in words is "eight billion, one hundred twenty-one million, two hundred twenty-one thousand, two hundred eighteen".