1000221 has 8 divisors (see below), whose sum is σ = 1369824. Its totient is φ = 648720.

The previous prime is 1000213. The next prime is 1000231. The reversal of 1000221 is 1220001.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1000221 - 2³ = 1000213 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1000211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4395 + ... + 4616.

It is an arithmetic number, because the mean of its divisors is an integer number (171228).

2^1000221 is an apocalyptic number.

It is an amenable number.

1000221 is a deficient number, since it is larger than the sum of its proper divisors (369603).

1000221 is an equidigital number, since it uses as much as digits as its factorization.

1000221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9051.

The product of its (nonzero) digits is 4, while the sum is 6.

The square root of 1000221 is about 1000.1104938955. The cubic root of 1000221 is about 100.0073661241.

Adding to 1000221 its reverse (1220001), we get a palindrome (2220222).

It can be divided in two parts, 1000 and 221, that added together give a palindrome (1221).

The spelling of 1000221 in words is "one million, two hundred twenty-one", and thus it is an aban number.