12012203221 has 4 divisors (see below), whose sum is σ = 12012487200. Its totient is φ = 12011919244.

The previous prime is 12012203207. The next prime is 12012203249. The reversal of 12012203221 is 12230221021.

It is a happy number.

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, and also an emirpimes, since its reverse is a distinct semiprime: 12230221021 = 571 ⋅21418951.

It is a cyclic number.

It is not a de Polignac number, because 12012203221 - 2¹⁵ = 12012170453 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12012203195 and 12012203204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12012803221) 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, 64411 + ... + 167848.

It is an arithmetic number, because the mean of its divisors is an integer number (3003121800).

Almost surely, 2^12012203221 is an apocalyptic number.

It is an amenable number.

12012203221 is a deficient number, since it is larger than the sum of its proper divisors (283979).

12012203221 is an equidigital number, since it uses as much as digits as its factorization.

12012203221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 283978.

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 12012203221 its reverse (12230221021), we get a palindrome (24242424242).

The spelling of 12012203221 in words is "twelve billion, twelve million, two hundred three thousand, two hundred twenty-one".