223211221 has 4 divisors (see below), whose sum is σ = 234959200. Its totient is φ = 211463244.

The previous prime is 223211179. The next prime is 223211281. The reversal of 223211221 is 122112322.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 122112322 = 2 ⋅61056161.

It is a cyclic number.

It is not a de Polignac number, because 223211221 - 2²³ = 214822613 is a prime.

It is a super-3 number, since 3×223211221³ (a number of 26 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 223211195 and 223211204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (223211281) 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, 5873961 + ... + 5873998.

It is an arithmetic number, because the mean of its divisors is an integer number (58739800).

Almost surely, 2^223211221 is an apocalyptic number.

It is an amenable number.

223211221 is a deficient number, since it is larger than the sum of its proper divisors (11747979).

223211221 is a wasteful number, since it uses less digits than its factorization.

223211221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11747978.

The product of its digits is 96, while the sum is 16.

The square root of 223211221 is about 14940.2550513704. The cubic root of 223211221 is about 606.6040995666.

Adding to 223211221 its reverse (122112322), we get a palindrome (345323543).

The spelling of 223211221 in words is "two hundred twenty-three million, two hundred eleven thousand, two hundred twenty-one".