22220221 has 8 divisors (see below), whose sum is σ = 22512600. Its totient is φ = 21930048.

The previous prime is 22220213. The next prime is 22220227. The reversal of 22220221 is 12202222.

It can be written as a sum of positive squares in 4 ways, for example, as 6180196 + 16040025 = 2486^2 + 4005^2 .

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 22220221 - 2³ = 22220213 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 (22220227) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28975 + ... + 29731.

It is an arithmetic number, because the mean of its divisors is an integer number (2814075).

Almost surely, 2^22220221 is an apocalyptic number.

It is an amenable number.

22220221 is a deficient number, since it is larger than the sum of its proper divisors (292379).

22220221 is a wasteful number, since it uses less digits than its factorization.

22220221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1103.

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

The square root of 22220221 is about 4713.8329414607. The cubic root of 22220221 is about 281.1357820329.

Adding to 22220221 its reverse (12202222), we get a palindrome (34422443).

The spelling of 22220221 in words is "twenty-two million, two hundred twenty thousand, two hundred twenty-one".