21423133424 has 40 divisors (see below), whose sum is σ = 51749390208. Its totient is φ = 8346674880.

The previous prime is 21423133411. The next prime is 21423133427. The reversal of 21423133424 is 42433132412.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21423133427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8693222 + ... + 8695685.

Almost surely, 2^21423133424 is an apocalyptic number.

It is an amenable number.

21423133424 is an abundant number, since it is smaller than the sum of its proper divisors (30326256784).

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

21423133424 is a wasteful number, since it uses less digits than its factorization.

21423133424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17388933 (or 17388927 counting only the distinct ones).

The product of its digits is 13824, while the sum is 29.

Adding to 21423133424 its reverse (42433132412), we get a palindrome (63856265836).

The spelling of 21423133424 in words is "twenty-one billion, four hundred twenty-three million, one hundred thirty-three thousand, four hundred twenty-four".