21424013124 has 12 divisors (see below), whose sum is σ = 49989363984. Its totient is φ = 7141337704.

The previous prime is 21424013119. The next prime is 21424013167. The reversal of 21424013124 is 42131042412.

It is a tau number, because it is divible by the number of its divisors (12).

It is a junction number, because it is equal to n+sod(n) for n = 21424013094 and 21424013103.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 892667202 + ... + 892667225.

It is an arithmetic number, because the mean of its divisors is an integer number (4165780332).

Almost surely, 2^21424013124 is an apocalyptic number.

It is an amenable number.

21424013124 is an abundant number, since it is smaller than the sum of its proper divisors (28565350860).

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

21424013124 is a wasteful number, since it uses less digits than its factorization.

21424013124 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1785334434 (or 1785334432 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 24.

Adding to 21424013124 its reverse (42131042412), we get a palindrome (63555055536).

The spelling of 21424013124 in words is "twenty-one billion, four hundred twenty-four million, thirteen thousand, one hundred twenty-four".