11321561433543 has 64 divisors (see below), whose sum is σ = 16397670481920. Its totient is φ = 6926104022400.

The previous prime is 11321561433503. The next prime is 11321561433661. The reversal of 11321561433543 is 34533416512311.

It is not a de Polignac number, because 11321561433543 - 2¹² = 11321561429447 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 11321561433495 and 11321561433504.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11321561433503) 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 63 ways as a sum of consecutive naturals, for example, 89688730 + ... + 89814872.

It is an arithmetic number, because the mean of its divisors is an integer number (256213601280).

Almost surely, 2^{11321561433543} is an apocalyptic number.

11321561433543 is a deficient number, since it is larger than the sum of its proper divisors (5076109048377).

11321561433543 is a wasteful number, since it uses less digits than its factorization.

11321561433543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126620.

The product of its digits is 388800, while the sum is 42.

Adding to 11321561433543 its reverse (34533416512311), we get a palindrome (45854977945854).

The spelling of 11321561433543 in words is "eleven trillion, three hundred twenty-one billion, five hundred sixty-one million, four hundred thirty-three thousand, five hundred forty-three".