12002112221 has 4 divisors (see below), whose sum is σ = 13093213344. Its totient is φ = 10911011100.

The previous prime is 12002112203. The next prime is 12002112247. The reversal of 12002112221 is 12221120021.

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 de Polignac number, because none of the positive numbers 2^k-12002112221 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12002112196 and 12002112205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12002112271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 545550545 + ... + 545550566.

It is an arithmetic number, because the mean of its divisors is an integer number (3273303336).

Almost surely, 2^12002112221 is an apocalyptic number.

12002112221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12002112221 is a deficient number, since it is larger than the sum of its proper divisors (1091101123).

12002112221 is a wasteful number, since it uses less digits than its factorization.

12002112221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1091101122.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 12002112221 its reverse (12221120021), we get a palindrome (24223232242).

It can be divided in two parts, 120021 and 12221, that multiplied together give a palindrome (1466776641).

The spelling of 12002112221 in words is "twelve billion, two million, one hundred twelve thousand, two hundred twenty-one".