20116500021 has 24 divisors (see below), whose sum is σ = 30671784000. Its totient is φ = 12669728832.

The previous prime is 20116500007. The next prime is 20116500049. The reversal of 20116500021 is 12000561102.

20116500021 is a `hidden beast` number, since 2 + 0 + 11 + 650 + 0 + 0 + 2 + 1 = 666.

It is not a de Polignac number, because 20116500021 - 2¹⁷ = 20116368949 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20116499967 and 20116500003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20116500071) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 102456 + ... + 225233.

It is an arithmetic number, because the mean of its divisors is an integer number (1277991000).

Almost surely, 2^20116500021 is an apocalyptic number.

It is an amenable number.

20116500021 is a deficient number, since it is larger than the sum of its proper divisors (10555283979).

20116500021 is a wasteful number, since it uses less digits than its factorization.

20116500021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 328073 (or 328070 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 18.

The spelling of 20116500021 in words is "twenty billion, one hundred sixteen million, five hundred thousand, twenty-one".