1221118 has 4 divisors (see below), whose sum is σ = 1831680. Its totient is φ = 610558.

The previous prime is 1221113. The next prime is 1221119. The reversal of 1221118 is 8111221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8111221 = 67 ⋅121063.

It is a super-2 number, since 2×1221118² = 2982258339848, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 305278 + ... + 305281.

It is an arithmetic number, because the mean of its divisors is an integer number (457920).

2^1221118 is an apocalyptic number.

1221118 is a deficient number, since it is larger than the sum of its proper divisors (610562).

1221118 is an equidigital number, since it uses as much as digits as its factorization.

1221118 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 610561.

The product of its digits is 32, while the sum is 16.

The square root of 1221118 is about 1105.0420806467. The cubic root of 1221118 is about 106.8856028376.

Adding to 1221118 its reverse (8111221), we get a palindrome (9332339).

The spelling of 1221118 in words is "one million, two hundred twenty-one thousand, one hundred eighteen".