21222205021201 has 2 divisors, whose sum is σ = 21222205021202. Its totient is φ = 21222205021200.

The previous prime is 21222205021141. The next prime is 21222205021211. The reversal of 21222205021201 is 10212050222212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14109609388176 + 7112595633025 = 3756276^2 + 2666945^2 .

It is a cyclic number.

It is not a de Polignac number, because 21222205021201 - 2¹¹ = 21222205019153 is a prime.

It is not a weakly prime, because it can be changed into another prime (21222205021211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10611102510600 + 10611102510601.

It is an arithmetic number, because the mean of its divisors is an integer number (10611102510601).

Almost surely, 2^{21222205021201} is an apocalyptic number.

It is an amenable number.

21222205021201 is a deficient number, since it is larger than the sum of its proper divisors (1).

21222205021201 is an equidigital number, since it uses as much as digits as its factorization.

21222205021201 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 640, while the sum is 22.

Adding to 21222205021201 its reverse (10212050222212), we get a palindrome (31434255243413).

The spelling of 21222205021201 in words is "twenty-one trillion, two hundred twenty-two billion, two hundred five million, twenty-one thousand, two hundred one".