122220221 has 4 divisors (see below), whose sum is σ = 125201244. Its totient is φ = 119239200.

The previous prime is 122220209. The next prime is 122220223. The reversal of 122220221 is 122022221.

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 2208196 + 120012025 = 1486^2 + 10955^2 .

It is a cyclic number.

It is not a de Polignac number, because 122220221 - 2¹⁰ = 122219197 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 122220196 and 122220205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (122220223) 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, 1490450 + ... + 1490531.

It is an arithmetic number, because the mean of its divisors is an integer number (31300311).

Almost surely, 2^122220221 is an apocalyptic number.

It is an amenable number.

122220221 is a deficient number, since it is larger than the sum of its proper divisors (2981023).

122220221 is an equidigital number, since it uses as much as digits as its factorization.

122220221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2981022.

The product of its (nonzero) digits is 64, while the sum is 14.

The square root of 122220221 is about 11055.3254588004. The cubic root of 122220221 is about 496.2658090631.

Adding to 122220221 its reverse (122022221), we get a palindrome (244242442).

The spelling of 122220221 in words is "one hundred twenty-two million, two hundred twenty thousand, two hundred twenty-one".