201210122199991 has 2 divisors, whose sum is σ = 201210122199992. Its totient is φ = 201210122199990.

The previous prime is 201210122199923. The next prime is 201210122200019. The reversal of 201210122199991 is 199991221012102.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 201210122199991 - 2¹⁷ = 201210122068919 is a prime.

It is a super-2 number, since 2×201210122199991² (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 (201210122149991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100605061099995 + 100605061099996.

It is an arithmetic number, because the mean of its divisors is an integer number (100605061099996).

Almost surely, 2^{201210122199991} is an apocalyptic number.

201210122199991 is a deficient number, since it is larger than the sum of its proper divisors (1).

201210122199991 is an equidigital number, since it uses as much as digits as its factorization.

201210122199991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 104976, while the sum is 49.

The spelling of 201210122199991 in words is "two hundred one trillion, two hundred ten billion, one hundred twenty-two million, one hundred ninety-nine thousand, nine hundred ninety-one".