11011320021 has 64 divisors (see below), whose sum is σ = 17121242880. Its totient is φ = 6236559360.

The previous prime is 11011319911. The next prime is 11011320029. The reversal of 11011320021 is 12002311011.

It is not a de Polignac number, because 11011320021 - 2²³ = 11002931413 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 11011319979 and 11011320006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11011320029) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 8901015 + ... + 8902251.

It is an arithmetic number, because the mean of its divisors is an integer number (267519420).

Almost surely, 2^11011320021 is an apocalyptic number.

It is an amenable number.

11011320021 is a deficient number, since it is larger than the sum of its proper divisors (6109922859).

11011320021 is a wasteful number, since it uses less digits than its factorization.

11011320021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1606.

The product of its (nonzero) digits is 12, while the sum is 12.

Adding to 11011320021 its reverse (12002311011), we get a palindrome (23013631032).

The spelling of 11011320021 in words is "eleven billion, eleven million, three hundred twenty thousand, twenty-one".