21960021859 has 8 divisors (see below), whose sum is σ = 22182175008. Its totient is φ = 21737961600.

The previous prime is 21960021851. The next prime is 21960021883. The reversal of 21960021859 is 95812006912.

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 21960021859 - 2³ = 21960021851 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21960021851) 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, 514474 + ... + 555520.

It is an arithmetic number, because the mean of its divisors is an integer number (2772771876).

Almost surely, 2^21960021859 is an apocalyptic number.

21960021859 is a deficient number, since it is larger than the sum of its proper divisors (222153149).

21960021859 is a wasteful number, since it uses less digits than its factorization.

21960021859 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46445.

The product of its (nonzero) digits is 77760, while the sum is 43.

The spelling of 21960021859 in words is "twenty-one billion, nine hundred sixty million, twenty-one thousand, eight hundred fifty-nine".