21424130304 has 36 divisors (see below), whose sum is σ = 57019432176. Its totient is φ = 7141376512.

The previous prime is 21424130293. The next prime is 21424130309. The reversal of 21424130304 is 40303142412.

It is a super-2 number, since 2×21424130304² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is not an unprimeable number, because it can be changed into a prime (21424130309) 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, 13947234 + ... + 13948769.

It is an arithmetic number, because the mean of its divisors is an integer number (1583873116).

Almost surely, 2^21424130304 is an apocalyptic number.

21424130304 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21424130304 is an abundant number, since it is smaller than the sum of its proper divisors (35595301872).

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

21424130304 is an equidigital number, since it uses as much as digits as its factorization.

21424130304 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27896022 (or 27896008 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 24.

Adding to 21424130304 its reverse (40303142412), we get a palindrome (61727272716).

The spelling of 21424130304 in words is "twenty-one billion, four hundred twenty-four million, one hundred thirty thousand, three hundred four".