220922221 has 4 divisors (see below), whose sum is σ = 237916252. Its totient is φ = 203928192.

The previous prime is 220922209. The next prime is 220922267. The reversal of 220922221 is 122229022.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 122229022 = 2 ⋅61114511.

It can be written as a sum of positive squares in 2 ways, for example, as 35581225 + 185340996 = 5965^2 + 13614^2 .

It is not a de Polignac number, because 220922221 - 2⁵ = 220922189 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 220922192 and 220922201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220922201) 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, 8496996 + ... + 8497021.

It is an arithmetic number, because the mean of its divisors is an integer number (59479063).

Almost surely, 2^220922221 is an apocalyptic number.

It is an amenable number.

220922221 is a deficient number, since it is larger than the sum of its proper divisors (16994031).

220922221 is a wasteful number, since it uses less digits than its factorization.

220922221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16994030.

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 220922221 is about 14863.4525262471. The cubic root of 220922221 is about 604.5234240622.

The spelling of 220922221 in words is "two hundred twenty million, nine hundred twenty-two thousand, two hundred twenty-one".