221431403 has 8 divisors (see below), whose sum is σ = 229311216. Its totient is φ = 213688800.

The previous prime is 221431367. The next prime is 221431423. The reversal of 221431403 is 304134122.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 221431403 - 2¹² = 221427307 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221431423) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31013 + ... + 37478.

It is an arithmetic number, because the mean of its divisors is an integer number (28663902).

Almost surely, 2^221431403 is an apocalyptic number.

221431403 is a deficient number, since it is larger than the sum of its proper divisors (7879813).

221431403 is an equidigital number, since it uses as much as digits as its factorization.

221431403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68605.

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

The square root of 221431403 is about 14880.5713263974. The cubic root of 221431403 is about 604.9875033277.

Adding to 221431403 its reverse (304134122), we get a palindrome (525565525).

The spelling of 221431403 in words is "two hundred twenty-one million, four hundred thirty-one thousand, four hundred three".