21442016162221 has 2 divisors, whose sum is σ = 21442016162222. Its totient is φ = 21442016162220.

The previous prime is 21442016162207. The next prime is 21442016162293. The reversal of 21442016162221 is 12226161024412.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16272236260996 + 5169779901225 = 4033886^2 + 2273715^2 .

It is a cyclic number.

It is not a de Polignac number, because 21442016162221 - 2²⁵ = 21441982607789 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21442016165221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10721008081110 + 10721008081111.

It is an arithmetic number, because the mean of its divisors is an integer number (10721008081111).

Almost surely, 2^{21442016162221} is an apocalyptic number.

It is an amenable number.

21442016162221 is a deficient number, since it is larger than the sum of its proper divisors (1).

21442016162221 is an equidigital number, since it uses as much as digits as its factorization.

21442016162221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18432, while the sum is 34.

Adding to 21442016162221 its reverse (12226161024412), we get a palindrome (33668177186633).

The spelling of 21442016162221 in words is "twenty-one trillion, four hundred forty-two billion, sixteen million, one hundred sixty-two thousand, two hundred twenty-one".