2121218 has 8 divisors (see below), whose sum is σ = 3471120. Its totient is φ = 964180.

The previous prime is 2121199. The next prime is 2121239. The reversal of 2121218 is 8121212.

It is a happy number.

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

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

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 2121196 and 2121205.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 48188 + ... + 48231.

It is an arithmetic number, because the mean of its divisors is an integer number (433890).

2^2121218 is an apocalyptic number.

2121218 is the 779-th centered heptagonal number.

2121218 is a deficient number, since it is larger than the sum of its proper divisors (1349902).

2121218 is a wasteful number, since it uses less digits than its factorization.

2121218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96432.

The product of its digits is 64, while the sum is 17.

The square root of 2121218 is about 1456.4401807146. The cubic root of 2121218 is about 128.4877629694.

The spelling of 2121218 in words is "two million, one hundred twenty-one thousand, two hundred eighteen".