201222191 has 2 divisors, whose sum is σ = 201222192. Its totient is φ = 201222190.

The previous prime is 201222187. The next prime is 201222211. The reversal of 201222191 is 191222102.

It is a happy number.

It is an a-pointer prime, because the next prime (201222211) can be obtained adding 201222191 to its sum of digits (20).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 201222191 - 2² = 201222187 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (201222121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100611095 + 100611096.

It is an arithmetic number, because the mean of its divisors is an integer number (100611096).

Almost surely, 2^201222191 is an apocalyptic number.

201222191 is a deficient number, since it is larger than the sum of its proper divisors (1).

201222191 is an equidigital number, since it uses as much as digits as its factorization.

201222191 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 20.

The square root of 201222191 is about 14185.2807867874. The cubic root of 201222191 is about 585.9923653717.

Adding to 201222191 its reverse (191222102), we get a palindrome (392444293).

The spelling of 201222191 in words is "two hundred one million, two hundred twenty-two thousand, one hundred ninety-one".