12001122011221 has 4 divisors (see below), whose sum is σ = 13715568012832. Its totient is φ = 10286676009612.

The previous prime is 12001122011201. The next prime is 12001122011257. The reversal of 12001122011221 is 12211022110021.

12001122011221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 12001122011221 - 2¹⁹ = 12001121486933 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12001122011195 and 12001122011204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12001122011201) 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, 857223000795 + ... + 857223000808.

It is an arithmetic number, because the mean of its divisors is an integer number (3428892003208).

Almost surely, 2^{12001122011221} is an apocalyptic number.

It is an amenable number.

12001122011221 is a deficient number, since it is larger than the sum of its proper divisors (1714446001611).

12001122011221 is an equidigital number, since it uses as much as digits as its factorization.

12001122011221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1714446001610.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 12001122011221 its reverse (12211022110021), we get a palindrome (24212144121242).

The spelling of 12001122011221 in words is "twelve trillion, one billion, one hundred twenty-two million, eleven thousand, two hundred twenty-one".