11102320021 has 4 divisors (see below), whose sum is σ = 11956344652. Its totient is φ = 10248295392.

The previous prime is 11102320001. The next prime is 11102320037. The reversal of 11102320021 is 12002320111.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2625435121 + 8476884900 = 51239^2 + 92070^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11102320021 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13), and also a Moran number because the ratio is a prime number: 854024617 = 11102320021 / (1 + 1 + 1 + 0 + 2 + 3 + 2 + 0 + 0 + 2 + 1).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11102319983 and 11102320010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11102320001) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 427012296 + ... + 427012321.

It is an arithmetic number, because the mean of its divisors is an integer number (2989086163).

Almost surely, 2^11102320021 is an apocalyptic number.

It is an amenable number.

11102320021 is a deficient number, since it is larger than the sum of its proper divisors (854024631).

11102320021 is an equidigital number, since it uses as much as digits as its factorization.

11102320021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 854024630.

The product of its (nonzero) digits is 24, while the sum is 13.

Adding to 11102320021 its reverse (12002320111), we get a palindrome (23104640132).

It can be divided in two parts, 111023 and 20021, that added together give a square (131044 = 362²).

The spelling of 11102320021 in words is "eleven billion, one hundred two million, three hundred twenty thousand, twenty-one".