122221011221 has 4 divisors (see below), whose sum is σ = 123594281100. Its totient is φ = 120847741344.

The previous prime is 122221011191. The next prime is 122221011223. The reversal of 122221011221 is 122110122221.

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 72498255025 + 49722756196 = 269255^2 + 222986^2 .

It is a cyclic number.

It is not a de Polignac number, because 122221011221 - 2¹⁴ = 122220994837 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 122221011221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (122221011223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 686634806 + ... + 686634983.

It is an arithmetic number, because the mean of its divisors is an integer number (30898570275).

Almost surely, 2^122221011221 is an apocalyptic number.

It is an amenable number.

122221011221 is a deficient number, since it is larger than the sum of its proper divisors (1373269879).

122221011221 is an equidigital number, since it uses as much as digits as its factorization.

122221011221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1373269878.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 122221011221 its reverse (122110122221), we get a palindrome (244331133442).

The spelling of 122221011221 in words is "one hundred twenty-two billion, two hundred twenty-one million, eleven thousand, two hundred twenty-one".