21031310303 has 4 divisors (see below), whose sum is σ = 21032143608. Its totient is φ = 21030477000.

The previous prime is 21031310219. The next prime is 21031310347. The reversal of 21031310303 is 30301313012.

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 21031310303 - 2¹⁰ = 21031309279 is a prime.

It is a super-2 number, since 2×21031310303² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21031330303) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 377573 + ... + 429678.

It is an arithmetic number, because the mean of its divisors is an integer number (5258035902).

Almost surely, 2^21031310303 is an apocalyptic number.

21031310303 is a deficient number, since it is larger than the sum of its proper divisors (833305).

21031310303 is an equidigital number, since it uses as much as digits as its factorization.

21031310303 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 833304.

The product of its (nonzero) digits is 162, while the sum is 17.

Adding to 21031310303 its reverse (30301313012), we get a palindrome (51332623315).

The spelling of 21031310303 in words is "twenty-one billion, thirty-one million, three hundred ten thousand, three hundred three".