12232222221 has 4 divisors (see below), whose sum is σ = 16309629632. Its totient is φ = 8154814812.

The previous prime is 12232222207. The next prime is 12232222283. The reversal of 12232222221 is 12222223221.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 12232222221 - 2⁹ = 12232221709 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12232222421) 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, 2038703701 + ... + 2038703706.

It is an arithmetic number, because the mean of its divisors is an integer number (4077407408).

Almost surely, 2^12232222221 is an apocalyptic number.

It is an amenable number.

12232222221 is a deficient number, since it is larger than the sum of its proper divisors (4077407411).

12232222221 is an equidigital number, since it uses as much as digits as its factorization.

12232222221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4077407410.

The product of its digits is 768, while the sum is 21.

Adding to 12232222221 its reverse (12222223221), we get a palindrome (24454445442).

The spelling of 12232222221 in words is "twelve billion, two hundred thirty-two million, two hundred twenty-two thousand, two hundred twenty-one".