21304043403 has 16 divisors (see below), whose sum is σ = 28853776896. Its totient is φ = 13979304000.

The previous prime is 21304043401. The next prime is 21304043429. The reversal of 21304043403 is 30434040312.

It is not a de Polignac number, because 21304043403 - 2¹ = 21304043401 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21304043401) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6778 + ... + 206528.

It is an arithmetic number, because the mean of its divisors is an integer number (1803361056).

Almost surely, 2^21304043403 is an apocalyptic number.

21304043403 is a deficient number, since it is larger than the sum of its proper divisors (7549733493).

21304043403 is a wasteful number, since it uses less digits than its factorization.

21304043403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 200314.

The product of its (nonzero) digits is 3456, while the sum is 24.

Adding to 21304043403 its reverse (30434040312), we get a palindrome (51738083715).

The spelling of 21304043403 in words is "twenty-one billion, three hundred four million, forty-three thousand, four hundred three".