21822752920321 has 4 divisors (see below), whose sum is σ = 21822762629700. Its totient is φ = 21822743210944.

The previous prime is 21822752920307. The next prime is 21822752920327. The reversal of 21822752920321 is 12302925722812.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 982715342400 + 20840037577921 = 991320^2 + 4565089^2 .

It is a cyclic number.

It is not a de Polignac number, because 21822752920321 - 2⁵ = 21822752920289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21822752920327) 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, 445725 + ... + 6621493.

It is an arithmetic number, because the mean of its divisors is an integer number (5455690657425).

Almost surely, 2^{21822752920321} is an apocalyptic number.

It is an amenable number.

21822752920321 is a deficient number, since it is larger than the sum of its proper divisors (9709379).

21822752920321 is an equidigital number, since it uses as much as digits as its factorization.

21822752920321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9709378.

The product of its (nonzero) digits is 483840, while the sum is 46.

The spelling of 21822752920321 in words is "twenty-one trillion, eight hundred twenty-two billion, seven hundred fifty-two million, nine hundred twenty thousand, three hundred twenty-one".