221220085 has 8 divisors (see below), whose sum is σ = 265558176. Its totient is φ = 176913360.

The previous prime is 221220067. The next prime is 221220089. The reversal of 221220085 is 580022122.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 221220085 - 2⁹ = 221219573 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221220089) 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, 12462 + ... + 24448.

It is an arithmetic number, because the mean of its divisors is an integer number (33194772).

Almost surely, 2^221220085 is an apocalyptic number.

It is an amenable number.

221220085 is a deficient number, since it is larger than the sum of its proper divisors (44338091).

221220085 is a wasteful number, since it uses less digits than its factorization.

221220085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15683.

The product of its (nonzero) digits is 640, while the sum is 22.

The square root of 221220085 is about 14873.4691649258. The cubic root of 221220085 is about 604.7949900743.

The spelling of 221220085 in words is "two hundred twenty-one million, two hundred twenty thousand, eighty-five".