21231021303 has 6 divisors (see below), whose sum is σ = 30667030784. Its totient is φ = 14154014196.

The previous prime is 21231021281. The next prime is 21231021337. The reversal of 21231021303 is 30312013212.

It is not a de Polignac number, because 21231021303 - 2²¹ = 21228924151 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21231021403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1179501175 + ... + 1179501192.

Almost surely, 2^21231021303 is an apocalyptic number.

21231021303 is a deficient number, since it is larger than the sum of its proper divisors (9436009481).

21231021303 is a wasteful number, since it uses less digits than its factorization.

21231021303 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2359002373 (or 2359002370 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

Adding to 21231021303 its reverse (30312013212), we get a palindrome (51543034515).

The spelling of 21231021303 in words is "twenty-one billion, two hundred thirty-one million, twenty-one thousand, three hundred three".