12221013111221 has 4 divisors (see below), whose sum is σ = 12227072118252. Its totient is φ = 12214954104192.

The previous prime is 12221013111217. The next prime is 12221013111257. The reversal of 12221013111221 is 12211131012221.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 11332386382321 + 888626728900 = 3366361^2 + 942670^2 .

It is a cyclic number.

It is not a de Polignac number, because 12221013111221 - 2² = 12221013111217 is a prime.

It is a super-3 number, since 3×12221013111221³ (a number of 40 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12221013111193 and 12221013111202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12221013117221) 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 3 ways as a sum of consecutive naturals, for example, 3029500490 + ... + 3029504523.

It is an arithmetic number, because the mean of its divisors is an integer number (3056768029563).

Almost surely, 2^{12221013111221} is an apocalyptic number.

It is an amenable number.

12221013111221 is a deficient number, since it is larger than the sum of its proper divisors (6059007031).

12221013111221 is an equidigital number, since it uses as much as digits as its factorization.

12221013111221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6059007030.

The product of its (nonzero) digits is 96, while the sum is 20.

Adding to 12221013111221 its reverse (12211131012221), we get a palindrome (24432144123442).

The spelling of 12221013111221 in words is "twelve trillion, two hundred twenty-one billion, thirteen million, one hundred eleven thousand, two hundred twenty-one".