812121218 has 16 divisors (see below), whose sum is σ = 1283113440. Its totient is φ = 384444000.

The previous prime is 812121203. The next prime is 812121223.

812121218 is nontrivially palindromic in base 10.

812121218 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an alternating number because its digits alternate between even and odd.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 62918 + ... + 74718.

It is an arithmetic number, because the mean of its divisors is an integer number (80194590).

Almost surely, 2^812121218 is an apocalyptic number.

812121218 is a deficient number, since it is larger than the sum of its proper divisors (470992222).

812121218 is a wasteful number, since it uses less digits than its factorization.

812121218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13633.

The product of its digits is 512, while the sum is 26.

The square root of 812121218 is about 28497.7405771054. The cubic root of 812121218 is about 932.9827607120.

The spelling of 812121218 in words is "eight hundred twelve million, one hundred twenty-one thousand, two hundred eighteen".