21303323143 has 4 divisors (see below), whose sum is σ = 22229554608. Its totient is φ = 20377091680.

The previous prime is 21303323137. The next prime is 21303323213. The reversal of 21303323143 is 34132330312.

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 21303323143 - 2⁹ = 21303322631 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 (21303323123) 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, 463115698 + ... + 463115743.

It is an arithmetic number, because the mean of its divisors is an integer number (5557388652).

Almost surely, 2^21303323143 is an apocalyptic number.

21303323143 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

21303323143 is a deficient number, since it is larger than the sum of its proper divisors (926231465).

21303323143 is an equidigital number, since it uses as much as digits as its factorization.

21303323143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 926231464.

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

Adding to 21303323143 its reverse (34132330312), we get a palindrome (55435653455).

The spelling of 21303323143 in words is "twenty-one billion, three hundred three million, three hundred twenty-three thousand, one hundred forty-three".