231221330 has 8 divisors (see below), whose sum is σ = 416198412. Its totient is φ = 92488528.

The previous prime is 231221299. The next prime is 231221381. The reversal of 231221330 is 33122132.

It can be written as a sum of positive squares in 2 ways, for example, as 211498849 + 19722481 = 14543^2 + 4441^2 .

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

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 231221299 and 231221308.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11561057 + ... + 11561076.

Almost surely, 2^231221330 is an apocalyptic number.

231221330 is a deficient number, since it is larger than the sum of its proper divisors (184977082).

231221330 is a wasteful number, since it uses less digits than its factorization.

231221330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23122140.

The product of its (nonzero) digits is 216, while the sum is 17.

The square root of 231221330 is about 15205.9636327330. The cubic root of 231221330 is about 613.7751460503.

Adding to 231221330 its reverse (33122132), we get a palindrome (264343462).

The spelling of 231221330 in words is "two hundred thirty-one million, two hundred twenty-one thousand, three hundred thirty".