20021021211021 has 16 divisors (see below), whose sum is σ = 26869124420736. Its totient is φ = 13260318898176.

The previous prime is 20021021211007. The next prime is 20021021211031. The reversal of 20021021211021 is 12011212012002.

It is not a de Polignac number, because 20021021211021 - 2¹³ = 20021021202829 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20021021211031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22839400 + ... + 23699793.

It is an arithmetic number, because the mean of its divisors is an integer number (1679320276296).

Almost surely, 2^{20021021211021} is an apocalyptic number.

It is an amenable number.

20021021211021 is a deficient number, since it is larger than the sum of its proper divisors (6848103209715).

20021021211021 is a wasteful number, since it uses less digits than its factorization.

20021021211021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46540132.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 20021021211021 its reverse (12011212012002), we get a palindrome (32032233223023).

It can be divided in two parts, 2002102 and 1211021, that added together give a palindrome (3213123).

The spelling of 20021021211021 in words is "twenty trillion, twenty-one billion, twenty-one million, two hundred eleven thousand, twenty-one".