231221343 has 8 divisors (see below), whose sum is σ = 318240256. Its totient is φ = 149175000.

The previous prime is 231221299. The next prime is 231221381. The reversal of 231221343 is 343122132.

231221343 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 231221343 - 2⁹ = 231220831 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231221383) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1243033 + ... + 1243218.

It is an arithmetic number, because the mean of its divisors is an integer number (39780032).

Almost surely, 2^231221343 is an apocalyptic number.

231221343 is a deficient number, since it is larger than the sum of its proper divisors (87018913).

231221343 is a wasteful number, since it uses less digits than its factorization.

231221343 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2486285.

The product of its digits is 864, while the sum is 21.

The square root of 231221343 is about 15205.9640601969. The cubic root of 231221343 is about 613.7751575531.

Adding to 231221343 its reverse (343122132), we get a palindrome (574343475).

The spelling of 231221343 in words is "two hundred thirty-one million, two hundred twenty-one thousand, three hundred forty-three".