21011312303 has 8 divisors (see below), whose sum is σ = 21347223408. Its totient is φ = 20677371904.

The previous prime is 21011312281. The next prime is 21011312347. The reversal of 21011312303 is 30321311012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21011312303 - 2¹⁴ = 21011295919 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 (21011312363) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 471176 + ... + 513837.

It is an arithmetic number, because the mean of its divisors is an integer number (2668402926).

Almost surely, 2^21011312303 is an apocalyptic number.

21011312303 is a deficient number, since it is larger than the sum of its proper divisors (335911105).

21011312303 is an equidigital number, since it uses as much as digits as its factorization.

21011312303 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 985353.

The product of its (nonzero) digits is 108, while the sum is 17.

Adding to 21011312303 its reverse (30321311012), we get a palindrome (51332623315).

The spelling of 21011312303 in words is "twenty-one billion, eleven million, three hundred twelve thousand, three hundred three".