21552545233321 has 4 divisors (see below), whose sum is σ = 21905865647044. Its totient is φ = 21199224819600.

The previous prime is 21552545233301. The next prime is 21552545233333. The reversal of 21552545233321 is 12333254525512.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4897984233321 + 16654561000000 = 2213139^2 + 4081000^2 .

It is a cyclic number.

It is not a de Polignac number, because 21552545233321 - 2⁹ = 21552545232809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21552545233301) 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, 176660206770 + ... + 176660206891.

It is an arithmetic number, because the mean of its divisors is an integer number (5476466411761).

Almost surely, 2^{21552545233321} is an apocalyptic number.

It is an amenable number.

21552545233321 is a deficient number, since it is larger than the sum of its proper divisors (353320413723).

21552545233321 is an equidigital number, since it uses as much as digits as its factorization.

21552545233321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 353320413722.

The product of its digits is 1080000, while the sum is 43.

Adding to 21552545233321 its reverse (12333254525512), we get a palindrome (33885799758833).

The spelling of 21552545233321 in words is "twenty-one trillion, five hundred fifty-two billion, five hundred forty-five million, two hundred thirty-three thousand, three hundred twenty-one".