12001022221221 has 12 divisors (see below), whose sum is σ = 18910701682080. Its totient is φ = 7273346800680.

The previous prime is 12001022221213. The next prime is 12001022221229. The reversal of 12001022221221 is 12212222010021.

It is a happy number.

12001022221221 is a `hidden beast` number, since 1 + 200 + 1 + 0 + 22 + 221 + 221 = 666.

It is an interprime number because it is at equal distance from previous prime (12001022221213) and next prime (12001022221229).

It is not a de Polignac number, because 12001022221221 - 2³ = 12001022221213 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12001022221194 and 12001022221203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12001022221229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 60611223241 + ... + 60611223438.

It is an arithmetic number, because the mean of its divisors is an integer number (1575891806840).

Almost surely, 2^{12001022221221} is an apocalyptic number.

12001022221221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12001022221221 is a deficient number, since it is larger than the sum of its proper divisors (6909679460859).

12001022221221 is a wasteful number, since it uses less digits than its factorization.

12001022221221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121222446696 (or 121222446693 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 12001022221221 its reverse (12212222010021), we get a palindrome (24213244231242).

The spelling of 12001022221221 in words is "twelve trillion, one billion, twenty-two million, two hundred twenty-one thousand, two hundred twenty-one".