11155200021 has 12 divisors (see below), whose sum is σ = 18414933472. Its totient is φ = 6374399976.

The previous prime is 11155200019. The next prime is 11155200061. The reversal of 11155200021 is 12000255111.

11155200021 is a `hidden beast` number, since 111 + 552 + 0 + 0 + 0 + 2 + 1 = 666.

It is not a de Polignac number, because 11155200021 - 2¹ = 11155200019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11155199967 and 11155200003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11155200011) 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, 88533271 + ... + 88533396.

Almost surely, 2^11155200021 is an apocalyptic number.

It is an amenable number.

11155200021 is a deficient number, since it is larger than the sum of its proper divisors (7259733451).

11155200021 is a wasteful number, since it uses less digits than its factorization.

11155200021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 177066680 (or 177066677 counting only the distinct ones).

The product of its (nonzero) digits is 100, while the sum is 18.

Adding to 11155200021 its reverse (12000255111), we get a palindrome (23155455132).

The spelling of 11155200021 in words is "eleven billion, one hundred fifty-five million, two hundred thousand, twenty-one".