8121218 has 32 divisors (see below), whose sum is σ = 14636160. Its totient is φ = 3306240.

The previous prime is 8121209. The next prime is 8121283.

It is a happy number.

8121218 is nontrivially palindromic in base 10.

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

8121218 is a modest number, since divided by 1218 gives 812 as remainder.

It is a junction number, because it is equal to n+sod(n) for n = 8121193 and 8121202.

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, 33578 + ... + 33818.

It is an arithmetic number, because the mean of its divisors is an integer number (457380).

Almost surely, 2^8121218 is an apocalyptic number.

8121218 is a deficient number, since it is larger than the sum of its proper divisors (6514942).

8121218 is a wasteful number, since it uses less digits than its factorization.

8121218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 362.

The product of its digits is 256, while the sum is 23.

The square root of 8121218 is about 2849.7750788439. The cubic root of 8121218 is about 201.0050905041.

The spelling of 8121218 in words is "eight million, one hundred twenty-one thousand, two hundred eighteen".