21001134424 has 64 divisors (see below), whose sum is σ = 40305781440. Its totient is φ = 10256793600.

The previous prime is 21001134383. The next prime is 21001134437. The reversal of 21001134424 is 42443110012.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21001134395 and 21001134404.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21363837 + ... + 21364819.

It is an arithmetic number, because the mean of its divisors is an integer number (629777835).

Almost surely, 2^21001134424 is an apocalyptic number.

It is an amenable number.

21001134424 is a deficient number, since it is larger than the sum of its proper divisors (19304647016).

21001134424 is a wasteful number, since it uses less digits than its factorization.

21001134424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1420 (or 1416 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 22.

Adding to 21001134424 its reverse (42443110012), we get a palindrome (63444244436).

The spelling of 21001134424 in words is "twenty-one billion, one million, one hundred thirty-four thousand, four hundred twenty-four".