21102320211 has 16 divisors (see below), whose sum is σ = 32221960704. Its totient is φ = 12033702144.

The previous prime is 21102320191. The next prime is 21102320243. The reversal of 21102320211 is 11202320112.

It is not a de Polignac number, because 21102320211 - 2⁹ = 21102319699 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21102320111) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1021470 + ... + 1041923.

It is an arithmetic number, because the mean of its divisors is an integer number (2013872544).

Almost surely, 2^21102320211 is an apocalyptic number.

21102320211 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

21102320211 is a deficient number, since it is larger than the sum of its proper divisors (11119640493).

21102320211 is a wasteful number, since it uses less digits than its factorization.

21102320211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2063890.

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 21102320211 its reverse (11202320112), we get a palindrome (32304640323).

Subtracting from 21102320211 its reverse (11202320112), we obtain a palindrome (9900000099).

The spelling of 21102320211 in words is "twenty-one billion, one hundred two million, three hundred twenty thousand, two hundred eleven".