1221218 has 8 divisors (see below), whose sum is σ = 1845612. Its totient is φ = 606016.

The previous prime is 1221197. The next prime is 1221221. The reversal of 1221218 is 8121221.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1194649 + 26569 = 1093^2 + 163^2 .

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

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1221196 and 1221205.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1955 + ... + 2502.

2^1221218 is an apocalyptic number.

1221218 is a deficient number, since it is larger than the sum of its proper divisors (624394).

1221218 is a wasteful number, since it uses less digits than its factorization.

1221218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4596.

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

The square root of 1221218 is about 1105.0873268661. The cubic root of 1221218 is about 106.8885204559. Note that the first 3 decimals are identical.

Adding to 1221218 its reverse (8121221), we get a palindrome (9342439).

The spelling of 1221218 in words is "one million, two hundred twenty-one thousand, two hundred eighteen".