12001020222221 has 16 divisors (see below), whose sum is σ = 12958227108288. Its totient is φ = 11073809260800.

The previous prime is 12001020222199. The next prime is 12001020222223. The reversal of 12001020222221 is 12222202010021.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12001020222221 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12001020222221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12001020222223) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32278250 + ... + 32647931.

It is an arithmetic number, because the mean of its divisors is an integer number (809889194268).

Almost surely, 2^{12001020222221} is an apocalyptic number.

It is an amenable number.

12001020222221 is a deficient number, since it is larger than the sum of its proper divisors (957206886067).

12001020222221 is a wasteful number, since it uses less digits than its factorization.

12001020222221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64926412.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 12001020222221 its reverse (12222202010021), we get a palindrome (24223222232242).

The spelling of 12001020222221 in words is "twelve trillion, one billion, twenty million, two hundred twenty-two thousand, two hundred twenty-one".