231321224 has 8 divisors (see below), whose sum is σ = 433727310. Its totient is φ = 115660608.

The previous prime is 231321191. The next prime is 231321301. The reversal of 231321224 is 422123132.

231321224 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 230493124 + 828100 = 15182^2 + 910^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 231321196 and 231321205.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14457569 + ... + 14457584.

Almost surely, 2^231321224 is an apocalyptic number.

It is an amenable number.

231321224 is a deficient number, since it is larger than the sum of its proper divisors (202406086).

231321224 is a wasteful number, since it uses less digits than its factorization.

231321224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28915159 (or 28915155 counting only the distinct ones).

The product of its digits is 576, while the sum is 20.

The square root of 231321224 is about 15209.2479761492. The cubic root of 231321224 is about 613.8635225956.

Adding to 231321224 its reverse (422123132), we get a palindrome (653444356).

The spelling of 231321224 in words is "two hundred thirty-one million, three hundred twenty-one thousand, two hundred twenty-four".