21801858559 has 8 divisors (see below), whose sum is σ = 23694329120. Its totient is φ = 19940160096.

The previous prime is 21801858511. The next prime is 21801858563. The reversal of 21801858559 is 95585810812.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21801858559 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 (21801858599) 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, 7691547 + ... + 7694380.

It is an arithmetic number, because the mean of its divisors is an integer number (2961791140).

Almost surely, 2^21801858559 is an apocalyptic number.

21801858559 is a deficient number, since it is larger than the sum of its proper divisors (1892470561).

21801858559 is a wasteful number, since it uses less digits than its factorization.

21801858559 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15386049.

The product of its (nonzero) digits is 1152000, while the sum is 52.

The spelling of 21801858559 in words is "twenty-one billion, eight hundred one million, eight hundred fifty-eight thousand, five hundred fifty-nine".