21424456678 has 8 divisors (see below), whose sum is σ = 32159660400. Its totient is φ = 10704569880.

The previous prime is 21424456667. The next prime is 21424456679. The reversal of 21424456678 is 87665442412.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21424456679) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3825733 + ... + 3831328.

It is an arithmetic number, because the mean of its divisors is an integer number (4019957550).

Almost surely, 2^21424456678 is an apocalyptic number.

21424456678 is a deficient number, since it is larger than the sum of its proper divisors (10735203722).

21424456678 is a wasteful number, since it uses less digits than its factorization.

21424456678 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7658462.

The product of its digits is 2580480, while the sum is 49.

The spelling of 21424456678 in words is "twenty-one billion, four hundred twenty-four million, four hundred fifty-six thousand, six hundred seventy-eight".