21304111303 has 4 divisors (see below), whose sum is σ = 21336342088. Its totient is φ = 21271880520.

The previous prime is 21304111277. The next prime is 21304111313. The reversal of 21304111303 is 30311140312.

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-21304111303 is a prime.

It is a super-2 number, since 2×21304111303² (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 (21304111313) 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, 16114401 + ... + 16115722.

It is an arithmetic number, because the mean of its divisors is an integer number (5334085522).

Almost surely, 2^21304111303 is an apocalyptic number.

21304111303 is a deficient number, since it is larger than the sum of its proper divisors (32230785).

21304111303 is an equidigital number, since it uses as much as digits as its factorization.

21304111303 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32230784.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 21304111303 its reverse (30311140312), we get a palindrome (51615251615).

The spelling of 21304111303 in words is "twenty-one billion, three hundred four million, one hundred eleven thousand, three hundred three".