221149985 has 12 divisors (see below), whose sum is σ = 308707668. Its totient is φ = 151645536.

The previous prime is 221149967. The next prime is 221150021. The reversal of 221149985 is 589941122.

It can be written as a sum of positive squares in 2 ways, for example, as 95082001 + 126067984 = 9751^2 + 11228^2 .

It is not a de Polignac number, because 221149985 - 2¹² = 221145889 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 451082 + ... + 451571.

It is an arithmetic number, because the mean of its divisors is an integer number (25725639).

Almost surely, 2^221149985 is an apocalyptic number.

It is an amenable number.

221149985 is a deficient number, since it is larger than the sum of its proper divisors (87557683).

221149985 is an equidigital number, since it uses as much as digits as its factorization.

221149985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 902672 (or 902665 counting only the distinct ones).

The product of its digits is 51840, while the sum is 41.

The square root of 221149985 is about 14871.1124331706. The cubic root of 221149985 is about 604.7311010476.

The spelling of 221149985 in words is "two hundred twenty-one million, one hundred forty-nine thousand, nine hundred eighty-five".