1221116 has 24 divisors (see below), whose sum is σ = 2403744. Its totient is φ = 538560.

The previous prime is 1221113. The next prime is 1221119. The reversal of 1221116 is 6111221.

It is an interprime number because it is at equal distance from previous prime (1221113) and next prime (1221119).

It is a super-2 number, since 2×1221116² = 2982248570912, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1221116.

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 pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 686 + ... + 1706.

It is an arithmetic number, because the mean of its divisors is an integer number (100156).

2^1221116 is an apocalyptic number.

It is an amenable number.

1221116 is a deficient number, since it is larger than the sum of its proper divisors (1182628).

1221116 is a wasteful number, since it uses less digits than its factorization.

1221116 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1061 (or 1059 counting only the distinct ones).

The product of its digits is 24, while the sum is 14.

The square root of 1221116 is about 1105.0411757034. The cubic root of 1221116 is about 106.8855444836.

Adding to 1221116 its reverse (6111221), we get a palindrome (7332337).

The spelling of 1221116 in words is "one million, two hundred twenty-one thousand, one hundred sixteen".