12001001121221 has 48 divisors (see below), whose sum is σ = 14842043112960. Its totient is φ = 9648195228000.

The previous prime is 12001001121139. The next prime is 12001001121229. The reversal of 12001001121221 is 12212110010021.

12001001121221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 12001001121221 - 2¹⁰ = 12001001120197 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12001001121196 and 12001001121205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12001001121229) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 38870966 + ... + 39178488.

It is an arithmetic number, because the mean of its divisors is an integer number (309209231520).

Almost surely, 2^{12001001121221} is an apocalyptic number.

It is an amenable number.

12001001121221 is a deficient number, since it is larger than the sum of its proper divisors (2841041991739).

12001001121221 is a wasteful number, since it uses less digits than its factorization.

12001001121221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 307974 (or 307967 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 12001001121221 its reverse (12212110010021), we get a palindrome (24213111131242).

The spelling of 12001001121221 in words is "twelve trillion, one billion, one million, one hundred twenty-one thousand, two hundred twenty-one".