11155421472 has 96 divisors (see below), whose sum is σ = 31814995968. Its totient is φ = 3402018816.

The previous prime is 11155421467. The next prime is 11155421483. The reversal of 11155421472 is 27412455111.

It is a tau number, because it is divible by the number of its divisors (96).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 101473 + ... + 180575.

It is an arithmetic number, because the mean of its divisors is an integer number (331406208).

Almost surely, 2^11155421472 is an apocalyptic number.

11155421472 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 11155421472, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15907497984).

11155421472 is an abundant number, since it is smaller than the sum of its proper divisors (20659574496).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

11155421472 is a wasteful number, since it uses less digits than its factorization.

11155421472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79242 (or 79234 counting only the distinct ones).

The product of its digits is 11200, while the sum is 33.

Adding to 11155421472 its reverse (27412455111), we get a palindrome (38567876583).

The spelling of 11155421472 in words is "eleven billion, one hundred fifty-five million, four hundred twenty-one thousand, four hundred seventy-two".