12012233221 has 4 divisors (see below), whose sum is σ = 12191520352. Its totient is φ = 11832946092.

The previous prime is 12012233179. The next prime is 12012233267. The reversal of 12012233221 is 12233221021.

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 a cyclic number.

It is not a de Polignac number, because 12012233221 - 2¹¹ = 12012231173 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 (12012233921) 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, 89643465 + ... + 89643598.

It is an arithmetic number, because the mean of its divisors is an integer number (3047880088).

Almost surely, 2^12012233221 is an apocalyptic number.

It is an amenable number.

12012233221 is a deficient number, since it is larger than the sum of its proper divisors (179287131).

12012233221 is an equidigital number, since it uses as much as digits as its factorization.

12012233221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 179287130.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 12012233221 its reverse (12233221021), we get a palindrome (24245454242).

The spelling of 12012233221 in words is "twelve billion, twelve million, two hundred thirty-three thousand, two hundred twenty-one".