220236221 has 4 divisors (see below), whose sum is σ = 220438812. Its totient is φ = 220033632.

The previous prime is 220236199. The next prime is 220236223. The reversal of 220236221 is 122632022.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 122632022 = 2 ⋅61316011.

It can be written as a sum of positive squares in 2 ways, for example, as 153487321 + 66748900 = 12389^2 + 8170^2 .

It is a cyclic number.

It is not a de Polignac number, because 220236221 - 2⁶ = 220236157 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 220236193 and 220236202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220236223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 99656 + ... + 101841.

It is an arithmetic number, because the mean of its divisors is an integer number (55109703).

Almost surely, 2^220236221 is an apocalyptic number.

It is an amenable number.

220236221 is a deficient number, since it is larger than the sum of its proper divisors (202591).

220236221 is a wasteful number, since it uses less digits than its factorization.

220236221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 202590.

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 220236221 is about 14840.3578460898. The cubic root of 220236221 is about 603.8970602533.

Adding to 220236221 its reverse (122632022), we get a palindrome (342868243).

The spelling of 220236221 in words is "two hundred twenty million, two hundred thirty-six thousand, two hundred twenty-one".