12221331 has 16 divisors (see below), whose sum is σ = 16790400. Its totient is φ = 7902720.

The previous prime is 12221327. The next prime is 12221333. The reversal of 12221331 is 13312221.

It is not a de Polignac number, because 12221331 - 2² = 12221327 is a prime.

It is a super-2 number, since 2×12221331² = 298721862823122, 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 12221331.

It is not an unprimeable number, because it can be changed into a prime (12221333) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26995 + ... + 27443.

It is an arithmetic number, because the mean of its divisors is an integer number (1049400).

Almost surely, 2^12221331 is an apocalyptic number.

12221331 is a deficient number, since it is larger than the sum of its proper divisors (4569069).

12221331 is a wasteful number, since it uses less digits than its factorization.

12221331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 706.

The product of its digits is 72, while the sum is 15.

The square root of 12221331 is about 3495.9020295197. The cubic root of 12221331 is about 230.3418420254.

Adding to 12221331 its reverse (13312221), we get a palindrome (25533552).

The spelling of 12221331 in words is "twelve million, two hundred twenty-one thousand, three hundred thirty-one".