21101323203 has 24 divisors (see below), whose sum is σ = 32008704000. Its totient is φ = 13889465928.

The previous prime is 21101323153. The next prime is 21101323207. The reversal of 21101323203 is 30232310112.

21101323203 is a `hidden beast` number, since 211 + 0 + 132 + 320 + 3 = 666.

It is not a de Polignac number, because 21101323203 - 2⁹ = 21101322691 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21101323207) 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 23 ways as a sum of consecutive naturals, for example, 530403 + ... + 568796.

It is an arithmetic number, because the mean of its divisors is an integer number (1333696000).

Almost surely, 2^21101323203 is an apocalyptic number.

21101323203 is a deficient number, since it is larger than the sum of its proper divisors (10907380797).

21101323203 is an equidigital number, since it uses as much as digits as its factorization.

21101323203 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1099293 (or 1099281 counting only the distinct ones).

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

Adding to 21101323203 its reverse (30232310112), we get a palindrome (51333633315).

The spelling of 21101323203 in words is "twenty-one billion, one hundred one million, three hundred twenty-three thousand, two hundred three".