21333323221 has 16 divisors (see below), whose sum is σ = 24590905344. Its totient is φ = 18128444544.

The previous prime is 21333323197. The next prime is 21333323243. The reversal of 21333323221 is 12232333312.

It is not a de Polignac number, because 21333323221 - 2⁵ = 21333323189 is a prime.

It is a super-2 number, since 2×21333323221² (a number of 21 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 (21333323821) 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, 1319241 + ... + 1335313.

It is an arithmetic number, because the mean of its divisors is an integer number (1536931584).

Almost surely, 2^21333323221 is an apocalyptic number.

It is an amenable number.

21333323221 is a deficient number, since it is larger than the sum of its proper divisors (3257582123).

21333323221 is a wasteful number, since it uses less digits than its factorization.

21333323221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17700.

The product of its digits is 3888, while the sum is 25.

Adding to 21333323221 its reverse (12232333312), we get a palindrome (33565656533).

The spelling of 21333323221 in words is "twenty-one billion, three hundred thirty-three million, three hundred twenty-three thousand, two hundred twenty-one".