21113342303 has 4 divisors (see below), whose sum is σ = 21562562400. Its totient is φ = 20664122208.

The previous prime is 21113342231. The next prime is 21113342339. The reversal of 21113342303 is 30324331112.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21113342303 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 (21113342353) 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, 224609978 + ... + 224610071.

It is an arithmetic number, because the mean of its divisors is an integer number (5390640600).

Almost surely, 2^21113342303 is an apocalyptic number.

21113342303 is a deficient number, since it is larger than the sum of its proper divisors (449220097).

21113342303 is an equidigital number, since it uses as much as digits as its factorization.

21113342303 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 449220096.

The product of its (nonzero) digits is 1296, while the sum is 23.

Adding to 21113342303 its reverse (30324331112), we get a palindrome (51437673415).

The spelling of 21113342303 in words is "twenty-one billion, one hundred thirteen million, three hundred forty-two thousand, three hundred three".