221006 has 4 divisors (see below), whose sum is σ = 331512. Its totient is φ = 110502.

The previous prime is 220973. The next prime is 221021. The reversal of 221006 is 600122.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55250 + ... + 55253.

It is an arithmetic number, because the mean of its divisors is an integer number (82878).

2²²¹⁰⁰⁶ is an apocalyptic number.

221006 is a deficient number, since it is larger than the sum of its proper divisors (110506).

221006 is a wasteful number, since it uses less digits than its factorization.

221006 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110505.

The product of its (nonzero) digits is 24, while the sum is 11.

The square root of 221006 is about 470.1127524329. The cubic root of 221006 is about 60.4599830994.

Adding to 221006 its reverse (600122), we get a palindrome (821128).

The spelling of 221006 in words is "two hundred twenty-one thousand, six".