12221431 has 2 divisors, whose sum is σ = 12221432. Its totient is φ = 12221430.

The previous prime is 12221413. The next prime is 12221449. The reversal of 12221431 is 13412221.

Together with previous prime (12221413) it forms an Ormiston pair, because they use the same digits, order apart.

It is a balanced prime because it is at equal distance from previous prime (12221413) and next prime (12221449).

It is an emirp because it is prime and its reverse (13412221) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12221431 - 2⁵ = 12221399 is a prime.

It is a super-2 number, since 2×12221431² = 298726751375522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12221401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6110715 + 6110716.

It is an arithmetic number, because the mean of its divisors is an integer number (6110716).

Almost surely, 2^12221431 is an apocalyptic number.

12221431 is a deficient number, since it is larger than the sum of its proper divisors (1).

12221431 is an equidigital number, since it uses as much as digits as its factorization.

12221431 is an evil number, because the sum of its binary digits is even.

The product of its digits is 96, while the sum is 16.

The square root of 12221431 is about 3495.9163319508. The cubic root of 12221431 is about 230.3424702745.

Adding to 12221431 its reverse (13412221), we get a palindrome (25633652).

The spelling of 12221431 in words is "twelve million, two hundred twenty-one thousand, four hundred thirty-one".