221655266 has 16 divisors (see below), whose sum is σ = 389249280. Its totient is φ = 92677920.

The previous prime is 221655251. The next prime is 221655281. The reversal of 221655266 is 662556122.

It is an interprime number because it is at equal distance from previous prime (221655251) and next prime (221655281).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 192506 + ... + 193653.

It is an arithmetic number, because the mean of its divisors is an integer number (24328080).

Almost surely, 2^221655266 is an apocalyptic number.

221655266 is a deficient number, since it is larger than the sum of its proper divisors (167594014).

221655266 is a wasteful number, since it uses less digits than its factorization.

221655266 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 386209.

The product of its digits is 43200, while the sum is 35.

The square root of 221655266 is about 14888.0914156248. The cubic root of 221655266 is about 605.1913116715.

The spelling of 221655266 in words is "two hundred twenty-one million, six hundred fifty-five thousand, two hundred sixty-six".