20421073859 has 8 divisors (see below), whose sum is σ = 21704567040. Its totient is φ = 19158450696.

The previous prime is 20421073843. The next prime is 20421073901. The reversal of 20421073859 is 95837012402.

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 20421073859 - 2⁴ = 20421073843 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20421073819) 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, 5215487 + ... + 5219400.

It is an arithmetic number, because the mean of its divisors is an integer number (2713070880).

Almost surely, 2^20421073859 is an apocalyptic number.

20421073859 is a deficient number, since it is larger than the sum of its proper divisors (1283493181).

20421073859 is a wasteful number, since it uses less digits than its factorization.

20421073859 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10435009.

The product of its (nonzero) digits is 120960, while the sum is 41.

The spelling of 20421073859 in words is "twenty billion, four hundred twenty-one million, seventy-three thousand, eight hundred fifty-nine".