221371985 has 8 divisors (see below), whose sum is σ = 267131520. Its totient is φ = 176107504.

The previous prime is 221371981. The next prime is 221372003. The reversal of 221371985 is 589173122.

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 221371985 - 2² = 221371981 is a prime.

It is not an unprimeable number, because it can be changed into a prime (221371981) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 122777 + ... + 124566.

It is an arithmetic number, because the mean of its divisors is an integer number (33391440).

Almost surely, 2^221371985 is an apocalyptic number.

It is an amenable number.

221371985 is a deficient number, since it is larger than the sum of its proper divisors (45759535).

221371985 is a wasteful number, since it uses less digits than its factorization.

221371985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 247527.

The product of its digits is 30240, while the sum is 38.

The square root of 221371985 is about 14878.5746965225. The cubic root of 221371985 is about 604.9333851933.

The spelling of 221371985 in words is "two hundred twenty-one million, three hundred seventy-one thousand, nine hundred eighty-five".