221500985 has 16 divisors (see below), whose sum is σ = 277655040. Its totient is φ = 169417920.

The previous prime is 221500949. The next prime is 221500991. The reversal of 221500985 is 589005122.

It is not a de Polignac number, because 221500985 - 2⁸ = 221500729 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7520 + ... + 22350.

It is an arithmetic number, because the mean of its divisors is an integer number (17353440).

Almost surely, 2^221500985 is an apocalyptic number.

It is an amenable number.

221500985 is a deficient number, since it is larger than the sum of its proper divisors (56154055).

221500985 is a wasteful number, since it uses less digits than its factorization.

221500985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14968.

The product of its (nonzero) digits is 7200, while the sum is 32.

The square root of 221500985 is about 14882.9091578226. The cubic root of 221500985 is about 605.0508665653.

The spelling of 221500985 in words is "two hundred twenty-one million, five hundred thousand, nine hundred eighty-five".