21333221320 has 16 divisors (see below), whose sum is σ = 47999748060. Its totient is φ = 8533288512.

The previous prime is 21333221293. The next prime is 21333221321. The reversal of 21333221320 is 2312233312.

It can be written as a sum of positive squares in 2 ways, for example, as 20817295524 + 515925796 = 144282^2 + 22714^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21333221291 and 21333221300.

It is not an unprimeable number, because it can be changed into a prime (21333221321) 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, 266665227 + ... + 266665306.

Almost surely, 2^21333221320 is an apocalyptic number.

21333221320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21333221320 is an abundant number, since it is smaller than the sum of its proper divisors (26666526740).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21333221320 is a wasteful number, since it uses less digits than its factorization.

21333221320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 533330544 (or 533330540 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 22.

Adding to 21333221320 its reverse (2312233312), we get a palindrome (23645454632).

The spelling of 21333221320 in words is "twenty-one billion, three hundred thirty-three million, two hundred twenty-one thousand, three hundred twenty".