21110322203 has 4 divisors (see below), whose sum is σ = 22352105880. Its totient is φ = 19868538528.

The previous prime is 21110322161. The next prime is 21110322209. The reversal of 21110322203 is 30222301112.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21110322203 - 2¹² = 21110318107 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17), and also a Moran number because the ratio is a prime number: 1241783659 = 21110322203 / (2 + 1 + 1 + 1 + 0 + 3 + 2 + 2 + 2 + 0 + 3).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21110322209) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 620891813 + ... + 620891846.

It is an arithmetic number, because the mean of its divisors is an integer number (5588026470).

Almost surely, 2^21110322203 is an apocalyptic number.

21110322203 is a deficient number, since it is larger than the sum of its proper divisors (1241783677).

21110322203 is a wasteful number, since it uses less digits than its factorization.

21110322203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1241783676.

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 21110322203 its reverse (30222301112), we get a palindrome (51332623315).

The spelling of 21110322203 in words is "twenty-one billion, one hundred ten million, three hundred twenty-two thousand, two hundred three".