12211111101221 has 24 divisors (see below), whose sum is σ = 13661732484960. Its totient is φ = 10882066003200.

The previous prime is 12211111101193. The next prime is 12211111101269. The reversal of 12211111101221 is 12210111111221.

It is a de Polignac number, because none of the positive numbers 2^k-12211111101221 is a prime.

It is a super-2 number, since 2×12211111101221² (a number of 27 digits) contains 22 as substring.

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

It is a self number, because there is not a number n which added to its sum of digits gives 12211111101221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12211111101421) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9621266 + ... + 10816236.

It is an arithmetic number, because the mean of its divisors is an integer number (569238853540).

Almost surely, 2^{12211111101221} is an apocalyptic number.

It is an amenable number.

12211111101221 is a deficient number, since it is larger than the sum of its proper divisors (1450621383739).

12211111101221 is a wasteful number, since it uses less digits than its factorization.

12211111101221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1196885 (or 1196868 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 17.

Adding to 12211111101221 its reverse (12210111111221), we get a palindrome (24421222212442).

The spelling of 12211111101221 in words is "twelve trillion, two hundred eleven billion, one hundred eleven million, one hundred one thousand, two hundred twenty-one".