231321004 has 12 divisors (see below), whose sum is σ = 405118728. Its totient is φ = 115572800.

The previous prime is 231321001. The next prime is 231321019. The reversal of 231321004 is 400123132.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (231321001) 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, 15802 + ... + 26689.

It is an arithmetic number, because the mean of its divisors is an integer number (33759894).

Almost surely, 2^231321004 is an apocalyptic number.

It is an amenable number.

231321004 is a deficient number, since it is larger than the sum of its proper divisors (173797724).

231321004 is a wasteful number, since it uses less digits than its factorization.

231321004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43856 (or 43854 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 231321004 is about 15209.2407437058. The cubic root of 231321004 is about 613.8633279888.

Adding to 231321004 its reverse (400123132), we get a palindrome (631444136).

The spelling of 231321004 in words is "two hundred thirty-one million, three hundred twenty-one thousand, four".