12013232221 has 4 divisors (see below), whose sum is σ = 12013644352. Its totient is φ = 12012820092.

The previous prime is 12013232219. The next prime is 12013232237. The reversal of 12013232221 is 12223231021.

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 12013232221 - 2¹ = 12013232219 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 (12013202221) 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, 158715 + ... + 221848.

It is an arithmetic number, because the mean of its divisors is an integer number (3003411088).

Almost surely, 2^12013232221 is an apocalyptic number.

It is an amenable number.

12013232221 is a deficient number, since it is larger than the sum of its proper divisors (412131).

12013232221 is an equidigital number, since it uses as much as digits as its factorization.

12013232221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 412130.

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

Adding to 12013232221 its reverse (12223231021), we get a palindrome (24236463242).

The spelling of 12013232221 in words is "twelve billion, thirteen million, two hundred thirty-two thousand, two hundred twenty-one".