221121223 has 2 divisors, whose sum is σ = 221121224. Its totient is φ = 221121222.

The previous prime is 221121217. The next prime is 221121253. The reversal of 221121223 is 322121122.

It is a happy number.

221121223 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 221121223 - 2²⁵ = 187566791 is a prime.

It is a super-2 number, since 2×221121223² = 97789190522031458, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 221121197 and 221121206.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221121253) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110560611 + 110560612.

It is an arithmetic number, because the mean of its divisors is an integer number (110560612).

Almost surely, 2^221121223 is an apocalyptic number.

221121223 is a deficient number, since it is larger than the sum of its proper divisors (1).

221121223 is an equidigital number, since it uses as much as digits as its factorization.

221121223 is an evil number, because the sum of its binary digits is even.

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

The square root of 221121223 is about 14870.1453590743. The cubic root of 221121223 is about 604.7048835012.

Adding to 221121223 its reverse (322121122), we get a palindrome (543242345).

The spelling of 221121223 in words is "two hundred twenty-one million, one hundred twenty-one thousand, two hundred twenty-three".