12220000121221 has 4 divisors (see below), whose sum is σ = 12345979504012. Its totient is φ = 12094020738432.

The previous prime is 12220000121191. The next prime is 12220000121279. The reversal of 12220000121221 is 12212100002221.

It is a happy number.

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 6099393393025 + 6120606728196 = 2469695^2 + 2473986^2 .

It is a cyclic number.

It is not a de Polignac number, because 12220000121221 - 2²⁷ = 12219865903493 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12220000121195 and 12220000121204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12220000121321) 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, 62989691250 + ... + 62989691443.

It is an arithmetic number, because the mean of its divisors is an integer number (3086494876003).

Almost surely, 2^{12220000121221} is an apocalyptic number.

It is an amenable number.

12220000121221 is a deficient number, since it is larger than the sum of its proper divisors (125979382791).

12220000121221 is an equidigital number, since it uses as much as digits as its factorization.

12220000121221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125979382790.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 12220000121221 its reverse (12212100002221), we get a palindrome (24432100123442).

The spelling of 12220000121221 in words is "twelve trillion, two hundred twenty billion, one hundred twenty-one thousand, two hundred twenty-one".