12221222202221 has 4 divisors (see below), whose sum is σ = 12642643657500. Its totient is φ = 11799800746944.

The previous prime is 12221222202017. The next prime is 12221222202251. The reversal of 12221222202221 is 12220222212221.

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 2971193401225 + 9250028800996 = 1723715^2 + 3041386^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12221222202221 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12221222202251) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 210710727596 + ... + 210710727653.

It is an arithmetic number, because the mean of its divisors is an integer number (3160660914375).

Almost surely, 2^{12221222202221} is an apocalyptic number.

It is an amenable number.

12221222202221 is a deficient number, since it is larger than the sum of its proper divisors (421421455279).

12221222202221 is an equidigital number, since it uses as much as digits as its factorization.

12221222202221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 421421455278.

The product of its (nonzero) digits is 1024, while the sum is 23.

Adding to 12221222202221 its reverse (12220222212221), we get a palindrome (24441444414442).

The spelling of 12221222202221 in words is "twelve trillion, two hundred twenty-one billion, two hundred twenty-two million, two hundred two thousand, two hundred twenty-one".