231221003 has 8 divisors (see below), whose sum is σ = 252419328. Its totient is φ = 210510144.

The previous prime is 231220999. The next prime is 231221009. The reversal of 231221003 is 300122132.

It is a happy number.

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

It is not a de Polignac number, because 231221003 - 2² = 231220999 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (231221009) 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 7 ways as a sum of consecutive naturals, for example, 120875 + ... + 122772.

It is an arithmetic number, because the mean of its divisors is an integer number (31552416).

Almost surely, 2^231221003 is an apocalyptic number.

231221003 is a deficient number, since it is larger than the sum of its proper divisors (21198325).

231221003 is a wasteful number, since it uses less digits than its factorization.

231221003 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 243733.

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 231221003 is about 15205.9528803689. The cubic root of 231221003 is about 613.7748567106.

Adding to 231221003 its reverse (300122132), we get a palindrome (531343135).

The spelling of 231221003 in words is "two hundred thirty-one million, two hundred twenty-one thousand, three".