231124021 has 4 divisors (see below), whose sum is σ = 232460172. Its totient is φ = 229787872.

The previous prime is 231124009. The next prime is 231124039. The reversal of 231124021 is 120421132.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 105370225 + 125753796 = 10265^2 + 11214^2 .

It is a cyclic number.

It is not a de Polignac number, because 231124021 - 2⁵ = 231123989 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 231123986 and 231124004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231124081) 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, 667816 + ... + 668161.

It is an arithmetic number, because the mean of its divisors is an integer number (58115043).

Almost surely, 2^231124021 is an apocalyptic number.

It is an amenable number.

231124021 is a deficient number, since it is larger than the sum of its proper divisors (1336151).

231124021 is a wasteful number, since it uses less digits than its factorization.

231124021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1336150.

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 231124021 is about 15202.7635974516. The cubic root of 231124021 is about 613.6890319850.

Adding to 231124021 its reverse (120421132), we get a palindrome (351545153).

The spelling of 231124021 in words is "two hundred thirty-one million, one hundred twenty-four thousand, twenty-one".