21423591424 has 39 divisors (see below), whose sum is σ = 42860693487. Its totient is φ = 10707111936.

The previous prime is 21423591391. The next prime is 21423591473. The reversal of 21423591424 is 42419532412.

The square root of 21423591424 is 146368.

It is a perfect power (a square), and thus also a powerful number.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 9366409 + ... + 9368695.

Almost surely, 2^21423591424 is an apocalyptic number.

21423591424 is the 146368-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21423591424

21423591424 is an abundant number, since it is smaller than the sum of its proper divisors (21437102063).

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

21423591424 is an frugal number, since it uses more digits than its factorization.

21423591424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4598 (or 2289 counting only the distinct ones).

The product of its digits is 69120, while the sum is 37.

The spelling of 21423591424 in words is "twenty-one billion, four hundred twenty-three million, five hundred ninety-one thousand, four hundred twenty-four".