21043224022321 has 4 divisors (see below), whose sum is σ = 21164861155572. Its totient is φ = 20921586889072.

The previous prime is 21043224022259. The next prime is 21043224022333. The reversal of 21043224022321 is 12322042234012.

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 15343359043600 + 5699864978721 = 3917060^2 + 2387439^2 .

It is a cyclic number.

It is not a de Polignac number, because 21043224022321 - 2³¹ = 21041076538673 is a prime.

It is a super-3 number, since 3×21043224022321³ (a number of 41 digits) contains 333 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21043224022321.

It is not an unprimeable number, because it can be changed into a prime (21043224062321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 60818566366 + ... + 60818566711.

It is an arithmetic number, because the mean of its divisors is an integer number (5291215288893).

Almost surely, 2^{21043224022321} is an apocalyptic number.

It is an amenable number.

21043224022321 is a deficient number, since it is larger than the sum of its proper divisors (121637133251).

21043224022321 is a wasteful number, since it uses less digits than its factorization.

21043224022321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121637133250.

The product of its (nonzero) digits is 9216, while the sum is 28.

Adding to 21043224022321 its reverse (12322042234012), we get a palindrome (33365266256333).

The spelling of 21043224022321 in words is "twenty-one trillion, forty-three billion, two hundred twenty-four million, twenty-two thousand, three hundred twenty-one".