202166221 has 16 divisors (see below), whose sum is σ = 220008960. Its totient is φ = 185290560.

The previous prime is 202166219. The next prime is 202166233. The reversal of 202166221 is 122661202.

It is a cyclic number.

It is not a de Polignac number, because 202166221 - 2¹ = 202166219 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 202166192 and 202166201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (202166201) 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, 45526 + ... + 49768.

It is an arithmetic number, because the mean of its divisors is an integer number (13750560).

Almost surely, 2^202166221 is an apocalyptic number.

It is an amenable number.

202166221 is a deficient number, since it is larger than the sum of its proper divisors (17842739).

202166221 is a wasteful number, since it uses less digits than its factorization.

202166221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4356.

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 202166221 is about 14218.5168354509. The cubic root of 202166221 is about 586.9073266184.

The spelling of 202166221 in words is "two hundred two million, one hundred sixty-six thousand, two hundred twenty-one".