20021200200021 has 16 divisors (see below), whose sum is σ = 26956654510464. Its totient is φ = 13217186658624.

The previous prime is 20021200200007. The next prime is 20021200200109. The reversal of 20021200200021 is 12000200212002.

It is not a de Polignac number, because 20021200200021 - 2¹⁰ = 20021200198997 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20021200200721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 72401001 + ... + 72677006.

It is an arithmetic number, because the mean of its divisors is an integer number (1684790906904).

Almost surely, 2^{20021200200021} is an apocalyptic number.

It is an amenable number.

20021200200021 is a deficient number, since it is larger than the sum of its proper divisors (6935454310443).

20021200200021 is a wasteful number, since it uses less digits than its factorization.

20021200200021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145078460.

The product of its (nonzero) digits is 32, while the sum is 12.

Adding to 20021200200021 its reverse (12000200212002), we get a palindrome (32021400412023).

The spelling of 20021200200021 in words is "twenty trillion, twenty-one billion, two hundred million, two hundred thousand, twenty-one".