12000020221221 has 16 divisors (see below), whose sum is σ = 16531871705088. Its totient is φ = 7734582198000.

The previous prime is 12000020221187. The next prime is 12000020221243. The reversal of 12000020221221 is 12212202000021.

It is not a de Polignac number, because 12000020221221 - 2⁷ = 12000020221093 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12000020221221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12000020221121) 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, 61287831 + ... + 61483316.

It is an arithmetic number, because the mean of its divisors is an integer number (1033241981568).

Almost surely, 2^{12000020221221} is an apocalyptic number.

It is an amenable number.

12000020221221 is a deficient number, since it is larger than the sum of its proper divisors (4531851483867).

12000020221221 is a wasteful number, since it uses less digits than its factorization.

12000020221221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122772232.

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 12000020221221 its reverse (12212202000021), we get a palindrome (24212222221242).

The spelling of 12000020221221 in words is "twelve trillion, twenty million, two hundred twenty-one thousand, two hundred twenty-one".