21101200000211 has 4 divisors (see below), whose sum is σ = 21126653800800. Its totient is φ = 21075746199624.

The previous prime is 21101200000169. The next prime is 21101200000261. The reversal of 21101200000211 is 11200000210112.

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-21101200000211 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21101200000192 and 21101200000201.

It is not an unprimeable number, because it can be changed into a prime (21101200000261) 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 3 ways as a sum of consecutive naturals, for example, 12726899051 + ... + 12726900708.

It is an arithmetic number, because the mean of its divisors is an integer number (5281663450200).

Almost surely, 2^{21101200000211} is an apocalyptic number.

21101200000211 is a deficient number, since it is larger than the sum of its proper divisors (25453800589).

21101200000211 is an equidigital number, since it uses as much as digits as its factorization.

21101200000211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25453800588.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 21101200000211 its reverse (11200000210112), we get a palindrome (32301200210323).

The spelling of 21101200000211 in words is "twenty-one trillion, one hundred one billion, two hundred million, two hundred eleven", and thus it is an aban number.