1231040532321 has 12 divisors (see below), whose sum is σ = 1778683476180. Its totient is φ = 820456541280.

The previous prime is 1231040532307. The next prime is 1231040532331. The reversal of 1231040532321 is 1232350401321.

1231040532321 is a `hidden beast` number, since 1 + 2 + 3 + 104 + 0 + 532 + 3 + 21 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 365917317921 + 865123214400 = 604911^2 + 930120^2 .

It is not a de Polignac number, because 1231040532321 - 2⁶ = 1231040532257 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1231040532331) 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, 19729366 + ... + 19791663.

It is an arithmetic number, because the mean of its divisors is an integer number (148223623015).

Almost surely, 2^{1231040532321} is an apocalyptic number.

It is an amenable number.

1231040532321 is a deficient number, since it is larger than the sum of its proper divisors (547642943859).

1231040532321 is a wasteful number, since it uses less digits than its factorization.

1231040532321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39524496 (or 39524493 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

Adding to 1231040532321 its reverse (1232350401321), we get a palindrome (2463390933642).

The spelling of 1231040532321 in words is "one trillion, two hundred thirty-one billion, forty million, five hundred thirty-two thousand, three hundred twenty-one".