221056266 has 16 divisors (see below), whose sum is σ = 461335104. Its totient is φ = 70481664.

The previous prime is 221056259. The next prime is 221056267. The reversal of 221056266 is 662650122.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (221056267) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 800791 + ... + 801066.

It is an arithmetic number, because the mean of its divisors is an integer number (28833444).

Almost surely, 2^221056266 is an apocalyptic number.

221056266 is an abundant number, since it is smaller than the sum of its proper divisors (240278838).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221056266 is a wasteful number, since it uses less digits than its factorization.

221056266 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1601885.

The product of its (nonzero) digits is 8640, while the sum is 30.

The square root of 221056266 is about 14867.9610572533. The cubic root of 221056266 is about 604.6456646083.

The spelling of 221056266 in words is "two hundred twenty-one million, fifty-six thousand, two hundred sixty-six".