231040403021 has 16 divisors (see below), whose sum is σ = 247125090240. Its totient is φ = 215598606720.

The previous prime is 231040402991. The next prime is 231040403057. The reversal of 231040403021 is 120304040132.

231040403021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-231040403021 is a prime.

It is a super-2 number, since 2×231040403021² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 231040402984 and 231040403002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231040403221) 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 15 ways as a sum of consecutive naturals, for example, 780791 + ... + 1035236.

It is an arithmetic number, because the mean of its divisors is an integer number (15445318140).

Almost surely, 2^231040403021 is an apocalyptic number.

It is an amenable number.

231040403021 is a deficient number, since it is larger than the sum of its proper divisors (16084687219).

231040403021 is a wasteful number, since it uses less digits than its factorization.

231040403021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1816204.

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 231040403021 its reverse (120304040132), we get a palindrome (351344443153).

The spelling of 231040403021 in words is "two hundred thirty-one billion, forty million, four hundred three thousand, twenty-one".