12201001221221 has 16 divisors (see below), whose sum is σ = 12493471239744. Its totient is φ = 11908930086144.

The previous prime is 12201001221137. The next prime is 12201001221223. The reversal of 12201001221221 is 12212210010221.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12201001221221 is a prime.

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 12201001221221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12201001221223) 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 15 ways as a sum of consecutive naturals, for example, 834135110 + ... + 834149736.

It is an arithmetic number, because the mean of its divisors is an integer number (780841952484).

Almost surely, 2^{12201001221221} is an apocalyptic number.

It is an amenable number.

12201001221221 is a deficient number, since it is larger than the sum of its proper divisors (292470018523).

12201001221221 is a wasteful number, since it uses less digits than its factorization.

12201001221221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26900.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 12201001221221 its reverse (12212210010221), we get a palindrome (24413211231442).

The spelling of 12201001221221 in words is "twelve trillion, two hundred one billion, one million, two hundred twenty-one thousand, two hundred twenty-one".