12221111112221 has 16 divisors (see below), whose sum is σ = 13589955465408. Its totient is φ = 10897295232000.

The previous prime is 12221111112209. The next prime is 12221111112229.

It is a happy number.

12221111112221 is nontrivially palindromic in base 10.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12221111112221 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12221111112193 and 12221111112202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12221111112229) 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, 51283460 + ... + 51521213.

It is an arithmetic number, because the mean of its divisors is an integer number (849372216588).

Almost surely, 2^{12221111112221} is an apocalyptic number.

12221111112221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12221111112221 is a deficient number, since it is larger than the sum of its proper divisors (1368844353187).

12221111112221 is a wasteful number, since it uses less digits than its factorization.

12221111112221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102804892.

The product of its digits is 64, while the sum is 20.

It can be divided in two parts, 1222111 and 1112221, that added together give a palindrome (2334332).

The spelling of 12221111112221 in words is "twelve trillion, two hundred twenty-one billion, one hundred eleven million, one hundred twelve thousand, two hundred twenty-one".