1002221 has 8 divisors (see below), whose sum is σ = 1101600. Its totient is φ = 904240.

The previous prime is 1002191. The next prime is 1002227. The reversal of 1002221 is 1222001.

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

It is a cyclic number.

It is not a de Polignac number, because 1002221 - 2¹⁰ = 1001197 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1002199 and 1002208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1002227) by changing a digit.

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, 1715 + ... + 2223.

It is an arithmetic number, because the mean of its divisors is an integer number (137700).

2^1002221 is an apocalyptic number.

1002221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1002221 is a deficient number, since it is larger than the sum of its proper divisors (99379).

1002221 is a wasteful number, since it uses less digits than its factorization.

1002221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 699.

The product of its (nonzero) digits is 8, while the sum is 8.

The square root of 1002221 is about 1001.1098840787. The cubic root of 1002221 is about 100.0739785915.

Adding to 1002221 its reverse (1222001), we get a palindrome (2224222).

The spelling of 1002221 in words is "one million, two thousand, two hundred twenty-one".