2166330220221 has 16 divisors (see below), whose sum is σ = 2900339694848. Its totient is φ = 1438275009600.

The previous prime is 2166330220213. The next prime is 2166330220231. The reversal of 2166330220221 is 1220220336612.

It is not a de Polignac number, because 2166330220221 - 2³ = 2166330220213 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 (2166330220211) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1334115 + ... + 2472351.

It is an arithmetic number, because the mean of its divisors is an integer number (181271230928).

Almost surely, 2^{2166330220221} is an apocalyptic number.

It is an amenable number.

2166330220221 is a deficient number, since it is larger than the sum of its proper divisors (734009474627).

2166330220221 is a wasteful number, since it uses less digits than its factorization.

2166330220221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1140852.

The product of its (nonzero) digits is 10368, while the sum is 30.

Adding to 2166330220221 its reverse (1220220336612), we get a palindrome (3386550556833).

The spelling of 2166330220221 in words is "two trillion, one hundred sixty-six billion, three hundred thirty million, two hundred twenty thousand, two hundred twenty-one".