21424533504 has 208 divisors, whose sum is σ = 64341156864. Its totient is φ = 6281625600.

The previous prime is 21424533479. The next prime is 21424533517. The reversal of 21424533504 is 40533542412.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4187652 + ... + 4192764.

Almost surely, 2^21424533504 is an apocalyptic number.

21424533504 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 21424533504, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32170578432).

21424533504 is an abundant number, since it is smaller than the sum of its proper divisors (42916623360).

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

21424533504 is a wasteful number, since it uses less digits than its factorization.

21424533504 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5182 (or 5160 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 33.

The spelling of 21424533504 in words is "twenty-one billion, four hundred twenty-four million, five hundred thirty-three thousand, five hundred four".