12002111221 has 4 divisors (see below), whose sum is σ = 12044521792. Its totient is φ = 11959700652.

The previous prime is 12002111213. The next prime is 12002111257. The reversal of 12002111221 is 12211120021.

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 12002111221 - 2³ = 12002111213 is a prime.

It is a super-2 number, since 2×12002111221² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12002111021) 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, 21204861 + ... + 21205426.

It is an arithmetic number, because the mean of its divisors is an integer number (3011130448).

Almost surely, 2^12002111221 is an apocalyptic number.

It is an amenable number.

12002111221 is a deficient number, since it is larger than the sum of its proper divisors (42410571).

12002111221 is an equidigital number, since it uses as much as digits as its factorization.

12002111221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42410570.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 12002111221 its reverse (12211120021), we get a palindrome (24213231242).

The spelling of 12002111221 in words is "twelve billion, two million, one hundred eleven thousand, two hundred twenty-one".