231003221 has 4 divisors (see below), whose sum is σ = 232822272. Its totient is φ = 229184172.

The previous prime is 231003211. The next prime is 231003229. The reversal of 231003221 is 122300132.

It is a happy number.

231003221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-231003221 is a prime.

It is a super-2 number, since 2×231003221² = 106724976224749682, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 231003196 and 231003205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231003229) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 909335 + ... + 909588.

It is an arithmetic number, because the mean of its divisors is an integer number (58205568).

Almost surely, 2^231003221 is an apocalyptic number.

It is an amenable number.

231003221 is a deficient number, since it is larger than the sum of its proper divisors (1819051).

231003221 is a wasteful number, since it uses less digits than its factorization.

231003221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1819050.

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

The square root of 231003221 is about 15198.7901163218. The cubic root of 231003221 is about 613.5820958126.

Adding to 231003221 its reverse (122300132), we get a palindrome (353303353).

The spelling of 231003221 in words is "two hundred thirty-one million, three thousand, two hundred twenty-one".