11155421543 has 16 divisors (see below), whose sum is σ = 13151491584. Its totient is φ = 9264641760.

The previous prime is 11155421533. The next prime is 11155421593. The reversal of 11155421543 is 34512455111.

It is a cyclic number.

It is not a de Polignac number, because 11155421543 - 2⁸ = 11155421287 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11155421513) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 166355 + ... + 223572.

It is an arithmetic number, because the mean of its divisors is an integer number (821968224).

Almost surely, 2^11155421543 is an apocalyptic number.

11155421543 is a deficient number, since it is larger than the sum of its proper divisors (1996070041).

11155421543 is an equidigital number, since it uses as much as digits as its factorization.

11155421543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 390062.

The product of its digits is 12000, while the sum is 32.

Adding to 11155421543 its reverse (34512455111), we get a palindrome (45667876654).

The spelling of 11155421543 in words is "eleven billion, one hundred fifty-five million, four hundred twenty-one thousand, five hundred forty-three".