12012002221 has 4 divisors (see below), whose sum is σ = 12124264032. Its totient is φ = 11899740412.

The previous prime is 12012002099. The next prime is 12012002269. The reversal of 12012002221 is 12220021021.

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: 12220021021 = 13 ⋅940001617.

It is a cyclic number.

It is not a de Polignac number, because 12012002221 - 2⁹ = 12012001709 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 (12012002021) 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, 56130745 + ... + 56130958.

It is an arithmetic number, because the mean of its divisors is an integer number (3031066008).

Almost surely, 2^12012002221 is an apocalyptic number.

It is an amenable number.

12012002221 is a deficient number, since it is larger than the sum of its proper divisors (112261811).

12012002221 is a wasteful number, since it uses less digits than its factorization.

12012002221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112261810.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 12012002221 its reverse (12220021021), we get a palindrome (24232023242).

The spelling of 12012002221 in words is "twelve billion, twelve million, two thousand, two hundred twenty-one".