21023011203 has 16 divisors (see below), whose sum is σ = 28081297920. Its totient is φ = 13990059936.

The previous prime is 21023011183. The next prime is 21023011213. The reversal of 21023011203 is 30211032012.

It is not a de Polignac number, because 21023011203 - 2⁵ = 21023011171 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21023011213) 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, 4980828 + ... + 4985046.

It is an arithmetic number, because the mean of its divisors is an integer number (1755081120).

Almost surely, 2^21023011203 is an apocalyptic number.

21023011203 is a deficient number, since it is larger than the sum of its proper divisors (7058286717).

21023011203 is a wasteful number, since it uses less digits than its factorization.

21023011203 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6826.

The product of its (nonzero) digits is 72, while the sum is 15.

Adding to 21023011203 its reverse (30211032012), we get a palindrome (51234043215).

The spelling of 21023011203 in words is "twenty-one billion, twenty-three million, eleven thousand, two hundred three".