221682172 has 12 divisors (see below), whose sum is σ = 391570200. Its totient is φ = 109804976.

The previous prime is 221682169. The next prime is 221682187. The reversal of 221682172 is 271286122.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 258547 + ... + 259402.

It is an arithmetic number, because the mean of its divisors is an integer number (32630850).

Almost surely, 2^221682172 is an apocalyptic number.

It is an amenable number.

221682172 is a deficient number, since it is larger than the sum of its proper divisors (169888028).

221682172 is a wasteful number, since it uses less digits than its factorization.

221682172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 518060 (or 518058 counting only the distinct ones).

The product of its digits is 5376, while the sum is 31.

The square root of 221682172 is about 14888.9949963052. The cubic root of 221682172 is about 605.2157980717.

The spelling of 221682172 in words is "two hundred twenty-one million, six hundred eighty-two thousand, one hundred seventy-two".