221672239 has 8 divisors (see below), whose sum is σ = 223134912. Its totient is φ = 220214400.

The previous prime is 221672237. The next prime is 221672249. The reversal of 221672239 is 932276122.

It is a happy number.

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 221672239 - 2¹ = 221672237 is a prime.

It is a Duffinian number.

It is a zygodrome in base 6.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221672233) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 139242 + ... + 140824.

It is an arithmetic number, because the mean of its divisors is an integer number (27891864).

Almost surely, 2^221672239 is an apocalyptic number.

221672239 is a deficient number, since it is larger than the sum of its proper divisors (1462673).

221672239 is a wasteful number, since it uses less digits than its factorization.

221672239 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2417.

The product of its digits is 18144, while the sum is 34.

The square root of 221672239 is about 14888.6614240502. The cubic root of 221672239 is about 605.2067585561.

The spelling of 221672239 in words is "two hundred twenty-one million, six hundred seventy-two thousand, two hundred thirty-nine".