221384985 has 16 divisors (see below), whose sum is σ = 366431040. Its totient is φ = 114000320.

The previous prime is 221384971. The next prime is 221385019. The reversal of 221384985 is 589483122.

It is not a de Polignac number, because 221384985 - 2¹⁵ = 221352217 is a prime.

It is a super-2 number, since 2×221384985² = 98022623166900450, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 254031 + ... + 254900.

It is an arithmetic number, because the mean of its divisors is an integer number (22901940).

Almost surely, 2^221384985 is an apocalyptic number.

It is an amenable number.

221384985 is a deficient number, since it is larger than the sum of its proper divisors (145046055).

221384985 is a wasteful number, since it uses less digits than its factorization.

221384985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 508968.

The product of its digits is 138240, while the sum is 42.

The square root of 221384985 is about 14879.0115599122. The cubic root of 221384985 is about 604.9452264690.

The spelling of 221384985 in words is "two hundred twenty-one million, three hundred eighty-four thousand, nine hundred eighty-five".