21031203303 has 96 divisors (see below), whose sum is σ = 37254297600. Its totient is φ = 11281939200.

The previous prime is 21031203247. The next prime is 21031203311. The reversal of 21031203303 is 30330213012.

21031203303 is a `hidden beast` number, since 21 + 0 + 312 + 0 + 330 + 3 = 666.

It is not a de Polignac number, because 21031203303 - 2¹³ = 21031195111 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21031203383) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1684801 + ... + 1697237.

It is an arithmetic number, because the mean of its divisors is an integer number (388065600).

Almost surely, 2^21031203303 is an apocalyptic number.

21031203303 is a deficient number, since it is larger than the sum of its proper divisors (16223094297).

21031203303 is a wasteful number, since it uses less digits than its factorization.

21031203303 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12533 (or 12530 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 18.

Adding to 21031203303 its reverse (30330213012), we get a palindrome (51361416315).

The spelling of 21031203303 in words is "twenty-one billion, thirty-one million, two hundred three thousand, three hundred three".