21433420224 has 168 divisors, whose sum is σ = 63837830160. Its totient is φ = 6867259392.

The previous prime is 21433420223. The next prime is 21433420237. The reversal of 21433420224 is 42202433412.

21433420224 is a `hidden beast` number, since 2 + 1 + 433 + 4 + 2 + 0 + 224 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21433420223) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3889279 + ... + 3894785.

Almost surely, 2^21433420224 is an apocalyptic number.

21433420224 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 21433420224, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31918915080).

21433420224 is an abundant number, since it is smaller than the sum of its proper divisors (42404409936).

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

21433420224 is a wasteful number, since it uses less digits than its factorization.

21433420224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5787 (or 5774 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 27.

Adding to 21433420224 its reverse (42202433412), we get a palindrome (63635853636).

The spelling of 21433420224 in words is "twenty-one billion, four hundred thirty-three million, four hundred twenty thousand, two hundred twenty-four".