201220010191 has 2 divisors, whose sum is σ = 201220010192. Its totient is φ = 201220010190.

The previous prime is 201220010177. The next prime is 201220010227. The reversal of 201220010191 is 191010022102.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 201220010191 - 2¹⁵ = 201219977423 is a prime.

It is a super-2 number, since 2×201220010191² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (201220010141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100610005095 + 100610005096.

It is an arithmetic number, because the mean of its divisors is an integer number (100610005096).

Almost surely, 2^201220010191 is an apocalyptic number.

201220010191 is a deficient number, since it is larger than the sum of its proper divisors (1).

201220010191 is an equidigital number, since it uses as much as digits as its factorization.

201220010191 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 19.

Adding to 201220010191 its reverse (191010022102), we get a palindrome (392230032293).

The spelling of 201220010191 in words is "two hundred one billion, two hundred twenty million, ten thousand, one hundred ninety-one".