91022001121201 has 4 divisors (see below), whose sum is σ = 91029836374372. Its totient is φ = 91014165868032.

The previous prime is 91022001121141. The next prime is 91022001121223. The reversal of 91022001121201 is 10212110022019.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 60826756320801 + 30195244800400 = 7799151^2 + 5495020^2 .

It is a cyclic number.

It is not a de Polignac number, because 91022001121201 - 2¹⁵ = 91022001088433 is a prime.

It is a super-2 number, since 2×91022001121201² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91022001121291) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3917609160 + ... + 3917632393.

It is an arithmetic number, because the mean of its divisors is an integer number (22757459093593).

Almost surely, 2^{91022001121201} is an apocalyptic number.

It is an amenable number.

91022001121201 is a deficient number, since it is larger than the sum of its proper divisors (7835253171).

91022001121201 is a wasteful number, since it uses less digits than its factorization.

91022001121201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7835253170.

The product of its (nonzero) digits is 144, while the sum is 22.

The spelling of 91022001121201 in words is "ninety-one trillion, twenty-two billion, one million, one hundred twenty-one thousand, two hundred one".