201222120221 has 2 divisors, whose sum is σ = 201222120222. Its totient is φ = 201222120220.

The previous prime is 201222120193. The next prime is 201222120257. The reversal of 201222120221 is 122021222102.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 193370388121 + 7851732100 = 439739^2 + 88610^2 .

It is a cyclic number.

It is not a de Polignac number, because 201222120221 - 2³⁴ = 184042251037 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 201222120221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (201222122221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100611060110 + 100611060111.

It is an arithmetic number, because the mean of its divisors is an integer number (100611060111).

Almost surely, 2^201222120221 is an apocalyptic number.

It is an amenable number.

201222120221 is a deficient number, since it is larger than the sum of its proper divisors (1).

201222120221 is an equidigital number, since it uses as much as digits as its factorization.

201222120221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 201222120221 its reverse (122021222102), we get a palindrome (323243342323).

The spelling of 201222120221 in words is "two hundred one billion, two hundred twenty-two million, one hundred twenty thousand, two hundred twenty-one".