201222121 has 2 divisors, whose sum is σ = 201222122. Its totient is φ = 201222120.

The previous prime is 201222067. The next prime is 201222163. The reversal of 201222121 is 121222102.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 173290896 + 27931225 = 13164^2 + 5285^2 .

It is a cyclic number.

It is not a de Polignac number, because 201222121 - 2¹¹ = 201220073 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (201222191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100611060 + 100611061.

It is an arithmetic number, because the mean of its divisors is an integer number (100611061).

Almost surely, 2^201222121 is an apocalyptic number.

It is an amenable number.

201222121 is a deficient number, since it is larger than the sum of its proper divisors (1).

201222121 is an equidigital number, since it uses as much as digits as its factorization.

201222121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32, while the sum is 13.

The square root of 201222121 is about 14185.2783194409. The cubic root of 201222121 is about 585.9922974211.

Adding to 201222121 its reverse (121222102), we get a palindrome (322444223).

The spelling of 201222121 in words is "two hundred one million, two hundred twenty-two thousand, one hundred twenty-one".