9691020022121 has 4 divisors (see below), whose sum is σ = 9691026266244. Its totient is φ = 9691013778000.

The previous prime is 9691020022081. The next prime is 9691020022127. The reversal of 9691020022121 is 1212200201969.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 3906706418521 + 5784313603600 = 1976539^2 + 2405060^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9691020022121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9691020022127) 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, 1205291 + ... + 4564511.

It is an arithmetic number, because the mean of its divisors is an integer number (2422756566561).

Almost surely, 2^{9691020022121} is an apocalyptic number.

It is an amenable number.

9691020022121 is a deficient number, since it is larger than the sum of its proper divisors (6244123).

9691020022121 is a wasteful number, since it uses less digits than its factorization.

9691020022121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6244122.

The product of its (nonzero) digits is 7776, while the sum is 35.

The spelling of 9691020022121 in words is "nine trillion, six hundred ninety-one billion, twenty million, twenty-two thousand, one hundred twenty-one".