20516982021 has 32 divisors (see below), whose sum is σ = 32019696000. Its totient is φ = 12948211584.

The previous prime is 20516982019. The next prime is 20516982047. The reversal of 20516982021 is 12028961502.

It is not a de Polignac number, because 20516982021 - 2¹ = 20516982019 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20516982001) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 689785 + ... + 718913.

It is an arithmetic number, because the mean of its divisors is an integer number (1000615500).

Almost surely, 2^20516982021 is an apocalyptic number.

It is an amenable number.

20516982021 is a deficient number, since it is larger than the sum of its proper divisors (11502713979).

20516982021 is a wasteful number, since it uses less digits than its factorization.

20516982021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30530 (or 30524 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 36.

The spelling of 20516982021 in words is "twenty billion, five hundred sixteen million, nine hundred eighty-two thousand, twenty-one".