223221221 has 4 divisors (see below), whose sum is σ = 224719500. Its totient is φ = 221722944.

The previous prime is 223221161. The next prime is 223221227. The reversal of 223221221 is 122122322.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 123520996 + 99700225 = 11114^2 + 9985^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-223221221 is a prime.

It is a super-3 number, since 3×223221221³ (a number of 26 digits) contains 333 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 223221221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (223221227) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 748916 + ... + 749213.

It is an arithmetic number, because the mean of its divisors is an integer number (56179875).

Almost surely, 2^223221221 is an apocalyptic number.

It is an amenable number.

223221221 is a deficient number, since it is larger than the sum of its proper divisors (1498279).

223221221 is a wasteful number, since it uses less digits than its factorization.

223221221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1498278.

The product of its digits is 192, while the sum is 17.

The square root of 223221221 is about 14940.5897139303. The cubic root of 223221221 is about 606.6131581770.

Adding to 223221221 its reverse (122122322), we get a palindrome (345343543).

The spelling of 223221221 in words is "two hundred twenty-three million, two hundred twenty-one thousand, two hundred twenty-one".