20210321220013 has 4 divisors (see below), whose sum is σ = 20210330441340. Its totient is φ = 20210311998688.

The previous prime is 20210321220007. The next prime is 20210321220029. The reversal of 20210321220013 is 31002212301202.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 10577572373124 + 9632748846889 = 3252318^2 + 3103667^2 .

It is a cyclic number.

It is not a de Polignac number, because 20210321220013 - 2¹⁷ = 20210321088941 is a prime.

It is a super-3 number, since 3×20210321220013³ (a number of 41 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20210321220083) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 769833 + ... + 6404161.

It is an arithmetic number, because the mean of its divisors is an integer number (5052582610335).

Almost surely, 2^{20210321220013} is an apocalyptic number.

It is an amenable number.

20210321220013 is a deficient number, since it is larger than the sum of its proper divisors (9221327).

20210321220013 is an equidigital number, since it uses as much as digits as its factorization.

20210321220013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9221326.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 20210321220013 its reverse (31002212301202), we get a palindrome (51212533521215).

The spelling of 20210321220013 in words is "twenty trillion, two hundred ten billion, three hundred twenty-one million, two hundred twenty thousand, thirteen".