221430317 has 4 divisors (see below), whose sum is σ = 221460096. Its totient is φ = 221400540.

The previous prime is 221430281. The next prime is 221430329. The reversal of 221430317 is 713034122.

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 a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221430317 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221430292 and 221430301.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221430367) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6692 + ... + 22082.

It is an arithmetic number, because the mean of its divisors is an integer number (55365024).

Almost surely, 2^221430317 is an apocalyptic number.

It is an amenable number.

221430317 is a deficient number, since it is larger than the sum of its proper divisors (29779).

221430317 is a wasteful number, since it uses less digits than its factorization.

221430317 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29778.

The product of its (nonzero) digits is 1008, while the sum is 23.

The square root of 221430317 is about 14880.5348358182. The cubic root of 221430317 is about 604.9865142817.

Adding to 221430317 its reverse (713034122), we get a palindrome (934464439).

The spelling of 221430317 in words is "two hundred twenty-one million, four hundred thirty thousand, three hundred seventeen".