12221131 has 4 divisors (see below), whose sum is σ = 13161232. Its totient is φ = 11281032.

The previous prime is 12221117. The next prime is 12221171. The reversal of 12221131 is 13112221.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 12221131 - 2¹³ = 12212939 is a prime.

It is a super-2 number, since 2×12221131² = 298712085838322, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (13), and also a Moran number because the ratio is a prime number: 940087 = 12221131 / (1 + 2 + 2 + 2 + 1 + 1 + 3 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12221171) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 470031 + ... + 470056.

It is an arithmetic number, because the mean of its divisors is an integer number (3290308).

Almost surely, 2^12221131 is an apocalyptic number.

12221131 is a deficient number, since it is larger than the sum of its proper divisors (940101).

12221131 is an equidigital number, since it uses as much as digits as its factorization.

12221131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 940100.

The product of its digits is 24, while the sum is 13.

The square root of 12221131 is about 3495.8734244821. The cubic root of 12221131 is about 230.3405855169.

Adding to 12221131 its reverse (13112221), we get a palindrome (25333352).

The spelling of 12221131 in words is "twelve million, two hundred twenty-one thousand, one hundred thirty-one".