221512223 has 4 divisors (see below), whose sum is σ = 223203288. Its totient is φ = 219821160.

The previous prime is 221512199. The next prime is 221512243. The reversal of 221512223 is 322215122.

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

It is a cyclic number.

It is not a de Polignac number, because 221512223 - 2⁸ = 221511967 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221512195 and 221512204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221512243) 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, 845336 + ... + 845597.

It is an arithmetic number, because the mean of its divisors is an integer number (55800822).

Almost surely, 2^221512223 is an apocalyptic number.

221512223 is a deficient number, since it is larger than the sum of its proper divisors (1691065).

221512223 is a wasteful number, since it uses less digits than its factorization.

221512223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1691064.

The product of its digits is 480, while the sum is 20.

The square root of 221512223 is about 14883.2867001882. The cubic root of 221512223 is about 605.0610989452.

Adding to 221512223 its reverse (322215122), we get a palindrome (543727345).

The spelling of 221512223 in words is "two hundred twenty-one million, five hundred twelve thousand, two hundred twenty-three".