12221231 has 4 divisors (see below), whose sum is σ = 13332264. Its totient is φ = 11110200.

The previous prime is 12221207. The next prime is 12221233. The reversal of 12221231 is 13212221.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13212221 = 11 ⋅1201111.

It is a cyclic number.

It is not a de Polignac number, because 12221231 - 2¹⁴ = 12204847 is a prime.

It is a super-2 number, since 2×12221231² = 298716974310722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12221233) 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, 555500 + ... + 555521.

It is an arithmetic number, because the mean of its divisors is an integer number (3333066).

Almost surely, 2^12221231 is an apocalyptic number.

12221231 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

12221231 is a deficient number, since it is larger than the sum of its proper divisors (1111033).

12221231 is a wasteful number, since it uses less digits than its factorization.

12221231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1111032.

The product of its digits is 48, while the sum is 14.

The square root of 12221231 is about 3495.8877270301. The cubic root of 12221231 is about 230.3412137729.

Adding to 12221231 its reverse (13212221), we get a palindrome (25433452).

The spelling of 12221231 in words is "twelve million, two hundred twenty-one thousand, two hundred thirty-one".