21100323211 has 24 divisors (see below), whose sum is σ = 25515442944. Its totient is φ = 17268746880.

The previous prime is 21100323203. The next prime is 21100323239. The reversal of 21100323211 is 11232300112.

It is not a de Polignac number, because 21100323211 - 2³ = 21100323203 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21100323611) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 71175 + ... + 217408.

It is an arithmetic number, because the mean of its divisors is an integer number (1063143456).

Almost surely, 2^21100323211 is an apocalyptic number.

21100323211 is a deficient number, since it is larger than the sum of its proper divisors (4415119733).

21100323211 is a wasteful number, since it uses less digits than its factorization.

21100323211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 288651 (or 288634 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 21100323211 its reverse (11232300112), we get a palindrome (32332623323).

The spelling of 21100323211 in words is "twenty-one billion, one hundred million, three hundred twenty-three thousand, two hundred eleven".