21222202021201 has 2 divisors, whose sum is σ = 21222202021202. Its totient is φ = 21222202021200.

The previous prime is 21222202021157. The next prime is 21222202021249. The reversal of 21222202021201 is 10212020222212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13047634846801 + 8174567174400 = 3612151^2 + 2859120^2 .

It is a cyclic number.

It is not a de Polignac number, because 21222202021201 - 2¹¹ = 21222202019153 is a prime.

It is not a weakly prime, because it can be changed into another prime (21222205021201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10611101010600 + 10611101010601.

It is an arithmetic number, because the mean of its divisors is an integer number (10611101010601).

Almost surely, 2^{21222202021201} is an apocalyptic number.

It is an amenable number.

21222202021201 is a deficient number, since it is larger than the sum of its proper divisors (1).

21222202021201 is an equidigital number, since it uses as much as digits as its factorization.

21222202021201 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 21222202021201 its reverse (10212020222212), we get a palindrome (31434222243413).

The spelling of 21222202021201 in words is "twenty-one trillion, two hundred twenty-two billion, two hundred two million, twenty-one thousand, two hundred one".