21304043420 has 24 divisors (see below), whose sum is σ = 48805627248. Its totient is φ = 7746924800.

The previous prime is 21304043401. The next prime is 21304043429. The reversal of 21304043420 is 2434040312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21304043429) 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, 48418061 + ... + 48418500.

It is an arithmetic number, because the mean of its divisors is an integer number (2033567802).

Almost surely, 2^21304043420 is an apocalyptic number.

21304043420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21304043420 is an abundant number, since it is smaller than the sum of its proper divisors (27501583828).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21304043420 is a wasteful number, since it uses less digits than its factorization.

21304043420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96836581 (or 96836579 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 23.

Adding to 21304043420 its reverse (2434040312), we get a palindrome (23738083732).

The spelling of 21304043420 in words is "twenty-one billion, three hundred four million, forty-three thousand, four hundred twenty".