91020220221113 has 2 divisors, whose sum is σ = 91020220221114. Its totient is φ = 91020220221112.

The previous prime is 91020220221083. The next prime is 91020220221137. The reversal of 91020220221113 is 31112202202019.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 78022118658169 + 12998101562944 = 8833013^2 + 3605288^2 .

It is an emirp because it is prime and its reverse (31112202202019) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 91020220221113 - 2¹⁰ = 91020220220089 is a prime.

It is a super-2 number, since 2×91020220221113² (a number of 29 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (91020220221193) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45510110110556 + 45510110110557.

It is an arithmetic number, because the mean of its divisors is an integer number (45510110110557).

Almost surely, 2^{91020220221113} is an apocalyptic number.

It is an amenable number.

91020220221113 is a deficient number, since it is larger than the sum of its proper divisors (1).

91020220221113 is an equidigital number, since it uses as much as digits as its factorization.

91020220221113 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 26.

The spelling of 91020220221113 in words is "ninety-one trillion, twenty billion, two hundred twenty million, two hundred twenty-one thousand, one hundred thirteen".