231021243 has 12 divisors (see below), whose sum is σ = 333930688. Its totient is φ = 153906480.

The previous prime is 231021233. The next prime is 231021257. The reversal of 231021243 is 342120132.

It is not a de Polignac number, because 231021243 - 2⁴ = 231021227 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (231021233) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5913 + ... + 22293.

Almost surely, 2^231021243 is an apocalyptic number.

231021243 is a deficient number, since it is larger than the sum of its proper divisors (102909445).

231021243 is a wasteful number, since it uses less digits than its factorization.

231021243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17954 (or 17951 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 231021243 is about 15199.3829808976. The cubic root of 231021243 is about 613.5980518513.

Adding to 231021243 its reverse (342120132), we get a palindrome (573141375).

The spelling of 231021243 in words is "two hundred thirty-one million, twenty-one thousand, two hundred forty-three".