21020321213211 has 16 divisors (see below), whose sum is σ = 28697474575616. Its totient is φ = 13678780088736.

The previous prime is 21020321213197. The next prime is 21020321213231. The reversal of 21020321213211 is 11231212302012.

It is not a de Polignac number, because 21020321213211 - 2²³ = 21020312824603 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21020321213231) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 52603360 + ... + 53001453.

It is an arithmetic number, because the mean of its divisors is an integer number (1793592160976).

Almost surely, 2^{21020321213211} is an apocalyptic number.

21020321213211 is a deficient number, since it is larger than the sum of its proper divisors (7677153362405).

21020321213211 is a wasteful number, since it uses less digits than its factorization.

21020321213211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105606402.

The product of its (nonzero) digits is 288, while the sum is 21.

Adding to 21020321213211 its reverse (11231212302012), we get a palindrome (32251533515223).

The spelling of 21020321213211 in words is "twenty-one trillion, twenty billion, three hundred twenty-one million, two hundred thirteen thousand, two hundred eleven".