11155330021 has 32 divisors (see below), whose sum is σ = 12524751360. Its totient is φ = 9850526400.

The previous prime is 11155330007. The next prime is 11155330031. The reversal of 11155330021 is 12003355111.

It is not a de Polignac number, because 11155330021 - 2³³ = 2565395429 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 11155329974 and 11155330001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11155330001) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 21915915 + ... + 21916423.

It is an arithmetic number, because the mean of its divisors is an integer number (391398480).

Almost surely, 2^11155330021 is an apocalyptic number.

11155330021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

11155330021 is a deficient number, since it is larger than the sum of its proper divisors (1369421339).

11155330021 is a wasteful number, since it uses less digits than its factorization.

11155330021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 945.

The product of its (nonzero) digits is 450, while the sum is 22.

Adding to 11155330021 its reverse (12003355111), we get a palindrome (23158685132).

The spelling of 11155330021 in words is "eleven billion, one hundred fifty-five million, three hundred thirty thousand, twenty-one".