21031103203 has 4 divisors (see below), whose sum is σ = 22943021688. Its totient is φ = 19119184720.

The previous prime is 21031103201. The next prime is 21031103213. The reversal of 21031103203 is 30230113012.

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 21031103203 - 2¹ = 21031103201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21031103201) 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, 955959226 + ... + 955959247.

It is an arithmetic number, because the mean of its divisors is an integer number (5735755422).

Almost surely, 2^21031103203 is an apocalyptic number.

21031103203 is a deficient number, since it is larger than the sum of its proper divisors (1911918485).

21031103203 is a wasteful number, since it uses less digits than its factorization.

21031103203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1911918484.

The product of its (nonzero) digits is 108, while the sum is 16.

Adding to 21031103203 its reverse (30230113012), we get a palindrome (51261216215).

The spelling of 21031103203 in words is "twenty-one billion, thirty-one million, one hundred three thousand, two hundred three".