2166170760221 has 16 divisors (see below), whose sum is σ = 2355464287680. Its totient is φ = 1980202412160.

The previous prime is 2166170760199. The next prime is 2166170760263. The reversal of 2166170760221 is 1220670716612.

It is a cyclic number.

It is not a de Polignac number, because 2166170760221 - 2¹⁰ = 2166170759197 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2166170769221) 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 in 15 ways as a sum of consecutive naturals, for example, 1223531 + ... + 2414408.

It is an arithmetic number, because the mean of its divisors is an integer number (147216517980).

Almost surely, 2^{2166170760221} is an apocalyptic number.

It is an amenable number.

2166170760221 is a deficient number, since it is larger than the sum of its proper divisors (189293527459).

2166170760221 is a wasteful number, since it uses less digits than its factorization.

2166170760221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3638396.

The product of its (nonzero) digits is 84672, while the sum is 41.

The spelling of 2166170760221 in words is "two trillion, one hundred sixty-six billion, one hundred seventy million, seven hundred sixty thousand, two hundred twenty-one".