91102232220121 has 2 divisors, whose sum is σ = 91102232220122. Its totient is φ = 91102232220120.

The previous prime is 91102232220119. The next prime is 91102232220133. The reversal of 91102232220121 is 12102223220119.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 47704770314496 + 43397461905625 = 6906864^2 + 6587675^2 .

It is an emirp because it is prime and its reverse (12102223220119) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 91102232220121 - 2¹ = 91102232220119 is a prime.

Together with 91102232220119, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 91102232220121.

It is not a weakly prime, because it can be changed into another prime (91102232200121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45551116110060 + 45551116110061.

It is an arithmetic number, because the mean of its divisors is an integer number (45551116110061).

Almost surely, 2^{91102232220121} is an apocalyptic number.

It is an amenable number.

91102232220121 is a deficient number, since it is larger than the sum of its proper divisors (1).

91102232220121 is an equidigital number, since it uses as much as digits as its factorization.

91102232220121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1728, while the sum is 28.

The spelling of 91102232220121 in words is "ninety-one trillion, one hundred two billion, two hundred thirty-two million, two hundred twenty thousand, one hundred twenty-one".