12221021231 has 4 divisors (see below), whose sum is σ = 12221247432. Its totient is φ = 12220795032.

The previous prime is 12221021213. The next prime is 12221021237. The reversal of 12221021231 is 13212012221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13212012221 = 47 ⋅281106643.

It is a cyclic number.

It is not a de Polignac number, because 12221021231 - 2¹⁴ = 12221004847 is a prime.

It is a super-2 number, since 2×12221021231² (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 (12221021237) 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, 20720 + ... + 157706.

It is an arithmetic number, because the mean of its divisors is an integer number (3055311858).

Almost surely, 2^12221021231 is an apocalyptic number.

12221021231 is a deficient number, since it is larger than the sum of its proper divisors (226201).

12221021231 is an equidigital number, since it uses as much as digits as its factorization.

12221021231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 226200.

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

Adding to 12221021231 its reverse (13212012221), we get a palindrome (25433033452).

The spelling of 12221021231 in words is "twelve billion, two hundred twenty-one million, twenty-one thousand, two hundred thirty-one".