91120202122121 has 2 divisors, whose sum is σ = 91120202122122. Its totient is φ = 91120202122120.

The previous prime is 91120202122097. The next prime is 91120202122189. The reversal of 91120202122121 is 12122120202119.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 87290994991225 + 3829207130896 = 9342965^2 + 1956836^2 .

It is an emirp because it is prime and its reverse (12122120202119) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 91120202122121 - 2¹⁰ = 91120202121097 is a prime.

It is not a weakly prime, because it can be changed into another prime (91120202122321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45560101061060 + 45560101061061.

It is an arithmetic number, because the mean of its divisors is an integer number (45560101061061).

Almost surely, 2^{91120202122121} is an apocalyptic number.

It is an amenable number.

91120202122121 is a deficient number, since it is larger than the sum of its proper divisors (1).

91120202122121 is an equidigital number, since it uses as much as digits as its factorization.

91120202122121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 26.

The spelling of 91120202122121 in words is "ninety-one trillion, one hundred twenty billion, two hundred two million, one hundred twenty-two thousand, one hundred twenty-one".