21424234224 has 80 divisors (see below), whose sum is σ = 58661915040. Its totient is φ = 6714408960.

The previous prime is 21424234193. The next prime is 21424234229. The reversal of 21424234224 is 42243242412.

It is a happy number.

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 21424234191 and 21424234200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21424234229) 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, 810334 + ... + 836354.

It is an arithmetic number, because the mean of its divisors is an integer number (733273938).

Almost surely, 2^21424234224 is an apocalyptic number.

21424234224 is a gapful number since it is divisible by the number (24) 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 21424234224, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29330957520).

21424234224 is an abundant number, since it is smaller than the sum of its proper divisors (37237680816).

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

21424234224 is a wasteful number, since it uses less digits than its factorization.

21424234224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27058 (or 27052 counting only the distinct ones).

The product of its digits is 24576, while the sum is 30.

Adding to 21424234224 its reverse (42243242412), we get a palindrome (63667476636).

The spelling of 21424234224 in words is "twenty-one billion, four hundred twenty-four million, two hundred thirty-four thousand, two hundred twenty-four".