12001013221 has 2 divisors, whose sum is σ = 12001013222. Its totient is φ = 12001013220.

The previous prime is 12001013207. The next prime is 12001013239. The reversal of 12001013221 is 12231010021.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9512100900 + 2488912321 = 97530^2 + 49889^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12001013221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12001013261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6000506610 + 6000506611.

It is an arithmetic number, because the mean of its divisors is an integer number (6000506611).

Almost surely, 2^12001013221 is an apocalyptic number.

It is an amenable number.

12001013221 is a deficient number, since it is larger than the sum of its proper divisors (1).

12001013221 is an equidigital number, since it uses as much as digits as its factorization.

12001013221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24, while the sum is 13.

Adding to 12001013221 its reverse (12231010021), we get a palindrome (24232023242).

The spelling of 12001013221 in words is "twelve billion, one million, thirteen thousand, two hundred twenty-one".