21822326685221 has 2 divisors, whose sum is σ = 21822326685222. Its totient is φ = 21822326685220.

The previous prime is 21822326685199. The next prime is 21822326685259. The reversal of 21822326685221 is 12258662322812.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21714565492321 + 107761192900 = 4659889^2 + 328270^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21822326685221 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21822326685221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21822326685281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10911163342610 + 10911163342611.

It is an arithmetic number, because the mean of its divisors is an integer number (10911163342611).

Almost surely, 2^{21822326685221} is an apocalyptic number.

It is an amenable number.

21822326685221 is a deficient number, since it is larger than the sum of its proper divisors (1).

21822326685221 is an equidigital number, since it uses as much as digits as its factorization.

21822326685221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2211840, while the sum is 50.

The spelling of 21822326685221 in words is "twenty-one trillion, eight hundred twenty-two billion, three hundred twenty-six million, six hundred eighty-five thousand, two hundred twenty-one".