21424430000 has 100 divisors (see below), whose sum is σ = 52185357840. Its totient is φ = 8517792000.

The previous prime is 21424429997. The next prime is 21424430009. The reversal of 21424430000 is 3442412.

It is a tau number, because it is divible by the number of its divisors (100).

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21424430009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1663586 + ... + 1676414.

Almost surely, 2^21424430000 is an apocalyptic number.

21424430000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21424430000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26092678920).

21424430000 is an abundant number, since it is smaller than the sum of its proper divisors (30760927840).

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

21424430000 is a wasteful number, since it uses less digits than its factorization.

21424430000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13024 (or 13003 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 20.

Adding to 21424430000 its reverse (3442412), we get a palindrome (21427872412).

The spelling of 21424430000 in words is "twenty-one billion, four hundred twenty-four million, four hundred thirty thousand".