21100323213 has 24 divisors (see below), whose sum is σ = 32828475680. Its totient is φ = 13016596320.

The previous prime is 21100323203. The next prime is 21100323239. The reversal of 21100323213 is 31232300112.

It is not a de Polignac number, because 21100323213 - 2¹³ = 21100315021 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 (21100323203) 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, 1427458 + ... + 1442163.

Almost surely, 2^21100323213 is an apocalyptic number.

It is an amenable number.

21100323213 is a deficient number, since it is larger than the sum of its proper divisors (11728152467).

21100323213 is a wasteful number, since it uses less digits than its factorization.

21100323213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2869689 (or 2869686 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

Adding to 21100323213 its reverse (31232300112), we get a palindrome (52332623325).

The spelling of 21100323213 in words is "twenty-one billion, one hundred million, three hundred twenty-three thousand, two hundred thirteen".