221022221 has 8 divisors (see below), whose sum is σ = 252975360. Its totient is φ = 189163728.

The previous prime is 221022211. The next prime is 221022229. The reversal of 221022221 is 122220122.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 221022221 - 2¹⁰ = 221021197 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221022196 and 221022205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221022229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18581 + ... + 28058.

It is an arithmetic number, because the mean of its divisors is an integer number (31621920).

Almost surely, 2^221022221 is an apocalyptic number.

It is an amenable number.

221022221 is a deficient number, since it is larger than the sum of its proper divisors (31953139).

221022221 is an equidigital number, since it uses as much as digits as its factorization.

221022221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47323.

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

The square root of 221022221 is about 14866.8161016406. The cubic root of 221022221 is about 604.6146224082.

Adding to 221022221 its reverse (122220122), we get a palindrome (343242343).

The spelling of 221022221 in words is "two hundred twenty-one million, twenty-two thousand, two hundred twenty-one".