21220132333221 has 6 divisors (see below), whose sum is σ = 30651302259110. Its totient is φ = 14146754888808.

The previous prime is 21220132333193. The next prime is 21220132333223. The reversal of 21220132333221 is 12233323102212.

21220132333221 is a `hidden beast` number, since 2 + 1 + 2 + 2 + 0 + 1 + 323 + 332 + 2 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 20272605305121 + 947527028100 = 4502511^2 + 973410^2 .

It is not a de Polignac number, because 21220132333221 - 2¹⁹ = 21220131808933 is a prime.

It is a super-2 number, since 2×21220132333221² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21220132333223) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1178896240726 + ... + 1178896240743.

Almost surely, 2^{21220132333221} is an apocalyptic number.

It is an amenable number.

21220132333221 is a deficient number, since it is larger than the sum of its proper divisors (9431169925889).

21220132333221 is a wasteful number, since it uses less digits than its factorization.

21220132333221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2357792481475 (or 2357792481472 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 27.

Adding to 21220132333221 its reverse (12233323102212), we get a palindrome (33453455435433).

The spelling of 21220132333221 in words is "twenty-one trillion, two hundred twenty billion, one hundred thirty-two million, three hundred thirty-three thousand, two hundred twenty-one".