222020221 has 4 divisors (see below), whose sum is σ = 235080252. Its totient is φ = 208960192.

The previous prime is 222020213. The next prime is 222020231. The reversal of 222020221 is 122020222.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 122020222 = 2 ⋅61010111.

It can be written as a sum of positive squares in 2 ways, for example, as 118265625 + 103754596 = 10875^2 + 10186^2 .

It is not a de Polignac number, because 222020221 - 2³ = 222020213 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 (222020231) 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, 6529990 + ... + 6530023.

It is an arithmetic number, because the mean of its divisors is an integer number (58770063).

Almost surely, 2^222020221 is an apocalyptic number.

It is an amenable number.

222020221 is a deficient number, since it is larger than the sum of its proper divisors (13060031).

222020221 is a wasteful number, since it uses less digits than its factorization.

222020221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13060030.

The product of its (nonzero) digits is 64, while the sum is 13.

The square root of 222020221 is about 14900.3429826296. The cubic root of 222020221 is about 605.5232783489.

Adding to 222020221 its reverse (122020222), we get a palindrome (344040443).

Subtracting from 222020221 its reverse (122020222), we obtain a palindrome (99999999).

The spelling of 222020221 in words is "two hundred twenty-two million, twenty thousand, two hundred twenty-one".