21101310211 has 4 divisors (see below), whose sum is σ = 21101775912. Its totient is φ = 21100844512.

The previous prime is 21101310169. The next prime is 21101310253. The reversal of 21101310211 is 11201310112.

It is a happy number.

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

It is an interprime number because it is at equal distance from previous prime (21101310169) and next prime (21101310253).

It is a cyclic number.

It is not a de Polignac number, because 21101310211 - 2¹⁵ = 21101277443 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21101310191 and 21101310200.

It is not an unprimeable number, because it can be changed into a prime (21101310011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 156550 + ... + 258283.

It is an arithmetic number, because the mean of its divisors is an integer number (5275443978).

Almost surely, 2^21101310211 is an apocalyptic number.

21101310211 is a deficient number, since it is larger than the sum of its proper divisors (465701).

21101310211 is an equidigital number, since it uses as much as digits as its factorization.

21101310211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 465700.

The product of its (nonzero) digits is 12, while the sum is 13.

Adding to 21101310211 its reverse (11201310112), we get a palindrome (32302620323).

Subtracting from 21101310211 its reverse (11201310112), we obtain a palindrome (9900000099).

The spelling of 21101310211 in words is "twenty-one billion, one hundred one million, three hundred ten thousand, two hundred eleven".