1221117 has 8 divisors (see below), whose sum is σ = 1633440. Its totient is φ = 811440.

The previous prime is 1221113. The next prime is 1221119. The reversal of 1221117 is 7111221.

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

It is not a de Polignac number, because 1221117 - 2² = 1221113 is a prime.

It is a super-2 number, since 2×1221117² = 2982253455378, which contains 22 as substring.

1221117 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 1221096 and 1221105.

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 in 7 ways as a sum of consecutive naturals, for example, 1059 + ... + 1887.

It is an arithmetic number, because the mean of its divisors is an integer number (204180).

2^1221117 is an apocalyptic number.

It is an amenable number.

1221117 is a deficient number, since it is larger than the sum of its proper divisors (412323).

1221117 is an equidigital number, since it uses as much as digits as its factorization.

1221117 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1323.

The product of its digits is 28, while the sum is 15.

The square root of 1221117 is about 1105.0416281752. The cubic root of 1221117 is about 106.8855736606.

Adding to 1221117 its reverse (7111221), we get a palindrome (8332338).

The spelling of 1221117 in words is "one million, two hundred twenty-one thousand, one hundred seventeen".