21432015110424 has 128 divisors (see below), whose sum is σ = 55648794700800. Its totient is φ = 6873042954240.

The previous prime is 21432015110393. The next prime is 21432015110447. The reversal of 21432015110424 is 42401151023412.

It is a junction number, because it is equal to n+sod(n) for n = 21432015110391 and 21432015110400.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 449859997 + ... + 449907635.

It is an arithmetic number, because the mean of its divisors is an integer number (434756208600).

Almost surely, 2^{21432015110424} is an apocalyptic number.

21432015110424 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 21432015110424, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27824397350400).

21432015110424 is an abundant number, since it is smaller than the sum of its proper divisors (34216779590376).

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

21432015110424 is a wasteful number, since it uses less digits than its factorization.

21432015110424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54025 (or 54021 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 30.

Adding to 21432015110424 its reverse (42401151023412), we get a palindrome (63833166133836).

The spelling of 21432015110424 in words is "twenty-one trillion, four hundred thirty-two billion, fifteen million, one hundred ten thousand, four hundred twenty-four".