12001002122221 has 8 divisors (see below), whose sum is σ = 13722157560960. Its totient is φ = 10281528324528.

The previous prime is 12001002122183. The next prime is 12001002122231. The reversal of 12001002122221 is 12222120010021.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12001002122221 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12001002122195 and 12001002122204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12001002122231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 420394966 + ... + 420423511.

It is an arithmetic number, because the mean of its divisors is an integer number (1715269695120).

Almost surely, 2^{12001002122221} is an apocalyptic number.

It is an amenable number.

12001002122221 is a deficient number, since it is larger than the sum of its proper divisors (1721155438739).

12001002122221 is an equidigital number, since it uses as much as digits as its factorization.

12001002122221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 840820523.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 12001002122221 its reverse (12222120010021), we get a palindrome (24223122132242).

The spelling of 12001002122221 in words is "twelve trillion, one billion, two million, one hundred twenty-two thousand, two hundred twenty-one".