221231403 has 12 divisors (see below), whose sum is σ = 320931000. Its totient is φ = 146853216.

The previous prime is 221231393. The next prime is 221231429. The reversal of 221231403 is 304132122.

It is not a de Polignac number, because 221231403 - 2⁵ = 221231371 is a prime.

It is not an unprimeable number, because it can be changed into a prime (221233403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 50653 + ... + 54846.

It is an arithmetic number, because the mean of its divisors is an integer number (26744250).

Almost surely, 2^221231403 is an apocalyptic number.

221231403 is a deficient number, since it is larger than the sum of its proper divisors (99699597).

221231403 is a wasteful number, since it uses less digits than its factorization.

221231403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105738 (or 105735 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 221231403 is about 14873.8496361904. The cubic root of 221231403 is about 604.8053040157.

Adding to 221231403 its reverse (304132122), we get a palindrome (525363525).

The spelling of 221231403 in words is "two hundred twenty-one million, two hundred thirty-one thousand, four hundred three".