221431223 has 4 divisors (see below), whose sum is σ = 238464408. Its totient is φ = 204398040.

The previous prime is 221431219. The next prime is 221431253. The reversal of 221431223 is 322134122.

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 221431223 - 2² = 221431219 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 221431195 and 221431204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221431213) 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, 8516573 + ... + 8516598.

It is an arithmetic number, because the mean of its divisors is an integer number (59616102).

Almost surely, 2^221431223 is an apocalyptic number.

221431223 is a deficient number, since it is larger than the sum of its proper divisors (17033185).

221431223 is a wasteful number, since it uses less digits than its factorization.

221431223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17033184.

The product of its digits is 576, while the sum is 20.

The square root of 221431223 is about 14880.5652782413. The cubic root of 221431223 is about 604.9873393976.

Adding to 221431223 its reverse (322134122), we get a palindrome (543565345).

The spelling of 221431223 in words is "two hundred twenty-one million, four hundred thirty-one thousand, two hundred twenty-three".