231040421 has 4 divisors (see below), whose sum is σ = 244631052. Its totient is φ = 217449792.

The previous prime is 231040363. The next prime is 231040423. The reversal of 231040421 is 124040132.

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 211557025 + 19483396 = 14545^2 + 4414^2 .

It is a cyclic number.

It is not a de Polignac number, because 231040421 - 2⁶ = 231040357 is a prime.

It is a super-2 number, since 2×231040421² = 106759352271714482, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (17), and also a Moran number because the ratio is a prime number: 13590613 = 231040421 / (2 + 3 + 1 + 0 + 4 + 0 + 4 + 2 + 1).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 231040421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231040423) 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, 6795290 + ... + 6795323.

It is an arithmetic number, because the mean of its divisors is an integer number (61157763).

Almost surely, 2^231040421 is an apocalyptic number.

It is an amenable number.

231040421 is a deficient number, since it is larger than the sum of its proper divisors (13590631).

231040421 is a wasteful number, since it uses less digits than its factorization.

231040421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13590630.

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 231040421 is about 15200.0138486779. The cubic root of 231040421 is about 613.6150304599.

Adding to 231040421 its reverse (124040132), we get a palindrome (355080553).

The spelling of 231040421 in words is "two hundred thirty-one million, forty thousand, four hundred twenty-one".