12221155 has 8 divisors (see below), whose sum is σ = 14691600. Its totient is φ = 9759456.

The previous prime is 12221117. The next prime is 12221171. The reversal of 12221155 is 55112221.

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

It is a cyclic number.

It is not a de Polignac number, because 12221155 - 2²¹ = 10124003 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1441 + ... + 5149.

It is an arithmetic number, because the mean of its divisors is an integer number (1836450).

Almost surely, 2^12221155 is an apocalyptic number.

12221155 is a deficient number, since it is larger than the sum of its proper divisors (2470445).

12221155 is an equidigital number, since it uses as much as digits as its factorization.

12221155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4373.

The product of its digits is 200, while the sum is 19.

The square root of 12221155 is about 3495.8768570989. The cubic root of 12221155 is about 230.3407362986.

Adding to 12221155 its reverse (55112221), we get a palindrome (67333376).

The spelling of 12221155 in words is "twelve million, two hundred twenty-one thousand, one hundred fifty-five".