221422403 has 4 divisors (see below), whose sum is σ = 231049488. Its totient is φ = 211795320.

The previous prime is 221422379. The next prime is 221422417. The reversal of 221422403 is 304224122.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221422403 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221422423) 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, 4813508 + ... + 4813553.

It is an arithmetic number, because the mean of its divisors is an integer number (57762372).

Almost surely, 2^221422403 is an apocalyptic number.

221422403 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

221422403 is a deficient number, since it is larger than the sum of its proper divisors (9627085).

221422403 is an equidigital number, since it uses as much as digits as its factorization.

221422403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9627084.

The product of its (nonzero) digits is 768, while the sum is 20.

The square root of 221422403 is about 14880.2689155808. The cubic root of 221422403 is about 604.9793067166.

Adding to 221422403 its reverse (304224122), we get a palindrome (525646525).

The spelling of 221422403 in words is "two hundred twenty-one million, four hundred twenty-two thousand, four hundred three".