21101100011 has 4 divisors (see below), whose sum is σ = 21138055224. Its totient is φ = 21064144800.

The previous prime is 21101099989. The next prime is 21101100061. The reversal of 21101100011 is 11000110112.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21101100011 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21101100061) 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, 18476750 + ... + 18477891.

It is an arithmetic number, because the mean of its divisors is an integer number (5284513806).

Almost surely, 2^21101100011 is an apocalyptic number.

21101100011 is a deficient number, since it is larger than the sum of its proper divisors (36955213).

21101100011 is an equidigital number, since it uses as much as digits as its factorization.

21101100011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36955212.

The product of its (nonzero) digits is 2, while the sum is 8.

Adding to 21101100011 its reverse (11000110112), we get a palindrome (32101210123).

The spelling of 21101100011 in words is "twenty-one billion, one hundred one million, one hundred thousand, eleven".