221630 has 16 divisors (see below), whose sum is σ = 410400. Its totient is φ = 86112.

The previous prime is 221623. The next prime is 221653. The reversal of 221630 is 36122.

It is a plaindrome in base 14.

It is a congruent number.

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 in 7 ways as a sum of consecutive naturals, for example, 71 + ... + 669.

It is an arithmetic number, because the mean of its divisors is an integer number (25650).

2²²¹⁶³⁰ is an apocalyptic number.

221630 is a deficient number, since it is larger than the sum of its proper divisors (188770).

221630 is a wasteful number, since it uses less digits than its factorization.

221630 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 643.

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 221630 is about 470.7759552059. The cubic root of 221630 is about 60.5168315986.

Adding to 221630 its reverse (36122), we get a palindrome (257752).

The spelling of 221630 in words is "two hundred twenty-one thousand, six hundred thirty".