201210122149991 has 2 divisors, whose sum is σ = 201210122149992. Its totient is φ = 201210122149990.

The previous prime is 201210122149987. The next prime is 201210122149999. The reversal of 201210122149991 is 199941221012102.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 201210122149991 - 2² = 201210122149987 is a prime.

It is a super-2 number, since 2×201210122149991² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (201210122149999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100605061074995 + 100605061074996.

It is an arithmetic number, because the mean of its divisors is an integer number (100605061074996).

Almost surely, 2^{201210122149991} is an apocalyptic number.

201210122149991 is a deficient number, since it is larger than the sum of its proper divisors (1).

201210122149991 is an equidigital number, since it uses as much as digits as its factorization.

201210122149991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 46656, while the sum is 44.

The spelling of 201210122149991 in words is "two hundred one trillion, two hundred ten billion, one hundred twenty-two million, one hundred forty-nine thousand, nine hundred ninety-one".