231244040421 has 18 divisors (see below), whose sum is σ = 354823135602. Its totient is φ = 145094298240.

The previous prime is 231244040347. The next prime is 231244040453. The reversal of 231244040421 is 124040442132.

231244040421 is a `hidden beast` number, since 231 + 2 + 4 + 4 + 0 + 4 + 0 + 421 = 666.

231244040421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 3 ways, for example, as 38479137921 + 192764902500 = 196161^2 + 439050^2 .

It is not a de Polignac number, because 231244040421 - 2⁹ = 231244039909 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231244040021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 44450310 + ... + 44455511.

Almost surely, 2^231244040421 is an apocalyptic number.

It is an amenable number.

231244040421 is a deficient number, since it is larger than the sum of its proper divisors (123579095181).

231244040421 is a wasteful number, since it uses less digits than its factorization.

231244040421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88905861 (or 88905841 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 27.

Adding to 231244040421 its reverse (124040442132), we get a palindrome (355284482553).

The spelling of 231244040421 in words is "two hundred thirty-one billion, two hundred forty-four million, forty thousand, four hundred twenty-one".