21101312203 has 8 divisors (see below), whose sum is σ = 22355982720. Its totient is φ = 19848132480.

The previous prime is 21101312179. The next prime is 21101312207. The reversal of 21101312203 is 30221310112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21101312203 - 2¹⁷ = 21101181131 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21101312207) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 343483 + ... + 400228.

It is an arithmetic number, because the mean of its divisors is an integer number (2794497840).

Almost surely, 2^21101312203 is an apocalyptic number.

21101312203 is a deficient number, since it is larger than the sum of its proper divisors (1254670517).

21101312203 is a wasteful number, since it uses less digits than its factorization.

21101312203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 745397.

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

Adding to 21101312203 its reverse (30221310112), we get a palindrome (51322622315).

The spelling of 21101312203 in words is "twenty-one billion, one hundred one million, three hundred twelve thousand, two hundred three".