11201100021 has 24 divisors (see below), whose sum is σ = 16650732384. Its totient is φ = 7250675040.

The previous prime is 11201100007. The next prime is 11201100047. The reversal of 11201100021 is 12000110211.

It is a happy number.

It is not a de Polignac number, because 11201100021 - 2⁵ = 11201099989 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 11201099976 and 11201100012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11201100221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 129250 + ... + 197756.

It is an arithmetic number, because the mean of its divisors is an integer number (693780516).

Almost surely, 2^11201100021 is an apocalyptic number.

It is an amenable number.

11201100021 is a deficient number, since it is larger than the sum of its proper divisors (5449632363).

11201100021 is a wasteful number, since it uses less digits than its factorization.

11201100021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69041 (or 69038 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

Adding to 11201100021 its reverse (12000110211), we get a palindrome (23201210232).

The spelling of 11201100021 in words is "eleven billion, two hundred one million, one hundred thousand, twenty-one".