21323211333221 has 24 divisors (see below), whose sum is σ = 26264257926336. Its totient is φ = 17201515793280.

The previous prime is 21323211333197. The next prime is 21323211333223. The reversal of 21323211333221 is 12233311232312.

It is not a de Polignac number, because 21323211333221 - 2²⁶ = 21323144224357 is a prime.

It is a super-2 number, since 2×21323211333221² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21323211333223) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 38297336 + ... + 38850126.

It is an arithmetic number, because the mean of its divisors is an integer number (1094344080264).

Almost surely, 2^{21323211333221} is an apocalyptic number.

It is an amenable number.

21323211333221 is a deficient number, since it is larger than the sum of its proper divisors (4941046593115).

21323211333221 is a wasteful number, since it uses less digits than its factorization.

21323211333221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 599129 (or 599122 counting only the distinct ones).

The product of its digits is 7776, while the sum is 29.

Adding to 21323211333221 its reverse (12233311232312), we get a palindrome (33556522565533).

The spelling of 21323211333221 in words is "twenty-one trillion, three hundred twenty-three billion, two hundred eleven million, three hundred thirty-three thousand, two hundred twenty-one".