21657084589 has 8 divisors (see below), whose sum is σ = 24917068800. Its totient is φ = 18438629136.

The previous prime is 21657084557. The next prime is 21657084611. The reversal of 21657084589 is 98548075612.

It is a happy number.

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 21657084589 - 2⁵ = 21657084557 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21657084539) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10381069 + ... + 10383154.

It is an arithmetic number, because the mean of its divisors is an integer number (3114633600).

Almost surely, 2^21657084589 is an apocalyptic number.

It is an amenable number.

21657084589 is a deficient number, since it is larger than the sum of its proper divisors (3259984211).

21657084589 is a wasteful number, since it uses less digits than its factorization.

21657084589 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20764379.

The product of its (nonzero) digits is 4838400, while the sum is 55.

The spelling of 21657084589 in words is "twenty-one billion, six hundred fifty-seven million, eighty-four thousand, five hundred eighty-nine".