12221210231 has 4 divisors (see below), whose sum is σ = 12226931232. Its totient is φ = 12215489232.

The previous prime is 12221210227. The next prime is 12221210233. The reversal of 12221210231 is 13201212221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13201212221 = 251 ⋅52594471.

It is a cyclic number.

It is not a de Polignac number, because 12221210231 - 2² = 12221210227 is a prime.

It is a super-2 number, since 2×12221210231² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12221210233) 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, 2857295 + ... + 2861568.

It is an arithmetic number, because the mean of its divisors is an integer number (3056732808).

Almost surely, 2^12221210231 is an apocalyptic number.

12221210231 is a deficient number, since it is larger than the sum of its proper divisors (5721001).

12221210231 is an equidigital number, since it uses as much as digits as its factorization.

12221210231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5721000.

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 12221210231 its reverse (13201212221), we get a palindrome (25422422452).

The spelling of 12221210231 in words is "twelve billion, two hundred twenty-one million, two hundred ten thousand, two hundred thirty-one".