1066221 has 18 divisors (see below), whose sum is σ = 1670058. Its totient is φ = 655200.

The previous prime is 1066217. The next prime is 1066231. The reversal of 1066221 is 1226601.

It is a happy number.

1066221 is a `hidden beast` number, since 1 + 0 + 662 + 2 + 1 = 666.

It can be written as a sum of positive squares in 3 ways, for example, as 44100 + 1022121 = 210^2 + 1011^2 .

It is not a de Polignac number, because 1066221 - 2² = 1066217 is a prime.

It is a super-2 number, since 2×1066221² = 2273654441682, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1066194 and 1066203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1066231) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 1171 + ... + 1871.

It is an arithmetic number, because the mean of its divisors is an integer number (92781).

2^1066221 is an apocalyptic number.

It is an amenable number.

1066221 is a deficient number, since it is larger than the sum of its proper divisors (603837).

1066221 is a wasteful number, since it uses less digits than its factorization.

1066221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 733 (or 717 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 1066221 is about 1032.5797790002. The cubic root of 1066221 is about 102.1603590631.

The spelling of 1066221 in words is "one million, sixty-six thousand, two hundred twenty-one".