21231334303 has 4 divisors (see below), whose sum is σ = 21274930960. Its totient is φ = 21187737648.

The previous prime is 21231334279. The next prime is 21231334337. The reversal of 21231334303 is 30343313212.

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 21231334303 - 2²¹ = 21229237151 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 (21231334363) 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, 21797598 + ... + 21798571.

It is an arithmetic number, because the mean of its divisors is an integer number (5318732740).

Almost surely, 2^21231334303 is an apocalyptic number.

21231334303 is a deficient number, since it is larger than the sum of its proper divisors (43596657).

21231334303 is an equidigital number, since it uses as much as digits as its factorization.

21231334303 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43596656.

The product of its (nonzero) digits is 3888, while the sum is 25.

Adding to 21231334303 its reverse (30343313212), we get a palindrome (51574647515).

The spelling of 21231334303 in words is "twenty-one billion, two hundred thirty-one million, three hundred thirty-four thousand, three hundred three".