221002 has 4 divisors (see below), whose sum is σ = 331506. Its totient is φ = 110500.

The previous prime is 220973. The next prime is 221021. The reversal of 221002 is 200122.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 152881 + 68121 = 391^2 + 261^2 .

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 55249 + ... + 55252.

2²²¹⁰⁰² is an apocalyptic number.

221002 is a deficient number, since it is larger than the sum of its proper divisors (110504).

221002 is a wasteful number, since it uses less digits than its factorization.

221002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110503.

The product of its (nonzero) digits is 8, while the sum is 7.

The square root of 221002 is about 470.1084981151. The cubic root of 221002 is about 60.4596183410.

Adding to 221002 its reverse (200122), we get a palindrome (421124).

It can be divided in two parts, 22 and 1002, that added together give a 10-th power (1024 = 2¹⁰).

The spelling of 221002 in words is "two hundred twenty-one thousand, two", and thus it is an iban number.