20021009511 has 16 divisors (see below), whose sum is σ = 26857923840. Its totient is φ = 13265891520.

The previous prime is 20021009509. The next prime is 20021009537. The reversal of 20021009511 is 11590012002.

It is not a de Polignac number, because 20021009511 - 2¹ = 20021009509 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20021009551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 449035 + ... + 491603.

It is an arithmetic number, because the mean of its divisors is an integer number (1678620240).

Almost surely, 2^20021009511 is an apocalyptic number.

20021009511 is a deficient number, since it is larger than the sum of its proper divisors (6836914329).

20021009511 is a wasteful number, since it uses less digits than its factorization.

20021009511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43526.

The product of its (nonzero) digits is 180, while the sum is 21.

The spelling of 20021009511 in words is "twenty billion, twenty-one million, nine thousand, five hundred eleven".