21101111101 has 8 divisors (see below), whose sum is σ = 24187117760. Its totient is φ = 18032995008.

The previous prime is 21101111089. The next prime is 21101111107. The reversal of 21101111101 is 10111110112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-21101111101 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21101111107) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4470111 + ... + 4474828.

It is an arithmetic number, because the mean of its divisors is an integer number (3023389720).

Almost surely, 2^21101111101 is an apocalyptic number.

It is an amenable number.

21101111101 is a deficient number, since it is larger than the sum of its proper divisors (3086006659).

21101111101 is an equidigital number, since it uses as much as digits as its factorization.

21101111101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8945283.

The product of its (nonzero) digits is 2, while the sum is 10.

Adding to 21101111101 its reverse (10111110112), we get a palindrome (31212221213).

The spelling of 21101111101 in words is "twenty-one billion, one hundred one million, one hundred eleven thousand, one hundred one".