21425856683 has 8 divisors (see below), whose sum is σ = 26712756480. Its totient is φ = 16695472680.

The previous prime is 21425856623. The next prime is 21425856709. The reversal of 21425856683 is 38665852412.

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

It is a cyclic number.

It is not a de Polignac number, because 21425856683 - 2²⁸ = 21157421227 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21425856623) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 139128863 + ... + 139129016.

It is an arithmetic number, because the mean of its divisors is an integer number (3339094560).

Almost surely, 2^21425856683 is an apocalyptic number.

21425856683 is a deficient number, since it is larger than the sum of its proper divisors (5286899797).

21425856683 is a wasteful number, since it uses less digits than its factorization.

21425856683 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 278257897.

The product of its digits is 2764800, while the sum is 50.

The spelling of 21425856683 in words is "twenty-one billion, four hundred twenty-five million, eight hundred fifty-six thousand, six hundred eighty-three".