231004221 has 24 divisors (see below), whose sum is σ = 355267392. Its totient is φ = 130790400.

The previous prime is 231004181. The next prime is 231004229. The reversal of 231004221 is 122400132.

It is not a de Polignac number, because 231004221 - 2²⁵ = 197449789 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 231004221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231004229) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 360061 + ... + 360701.

It is an arithmetic number, because the mean of its divisors is an integer number (14802808).

Almost surely, 2^231004221 is an apocalyptic number.

231004221 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

231004221 is a deficient number, since it is larger than the sum of its proper divisors (124263171).

231004221 is an equidigital number, since it uses as much as digits as its factorization.

231004221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 913 (or 782 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 231004221 is about 15198.8230136415. The cubic root of 231004221 is about 613.5829811988.

Adding to 231004221 its reverse (122400132), we get a palindrome (353404353).

The spelling of 231004221 in words is "two hundred thirty-one million, four thousand, two hundred twenty-one".