9821166121 has 12 divisors (see below), whose sum is σ = 10685194320. Its totient is φ = 9022693680.

The previous prime is 9821166119. The next prime is 9821166127. The reversal of 9821166121 is 1216611289.

It is not a de Polignac number, because 9821166121 - 2¹ = 9821166119 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9821166127) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 102051 + ... + 173368.

It is an arithmetic number, because the mean of its divisors is an integer number (890432860).

Almost surely, 2^9821166121 is an apocalyptic number.

It is an amenable number.

9821166121 is a deficient number, since it is larger than the sum of its proper divisors (864028199).

9821166121 is a wasteful number, since it uses less digits than its factorization.

9821166121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 275656 (or 275643 counting only the distinct ones).

The product of its digits is 10368, while the sum is 37.

The square root of 9821166121 is about 99101.7967596955. The cubic root of 9821166121 is about 2141.5144984959.

The spelling of 9821166121 in words is "nine billion, eight hundred twenty-one million, one hundred sixty-six thousand, one hundred twenty-one".