221204993433985 has 32 divisors (see below), whose sum is σ = 290213115470208. Its totient is φ = 160523448184320.

The previous prime is 221204993433967. The next prime is 221204993433989. The reversal of 221204993433985 is 589334399402122.

It is a happy number.

It is not a de Polignac number, because 221204993433985 - 2⁷ = 221204993433857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221204993433989) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 72606619 + ... + 75591871.

It is an arithmetic number, because the mean of its divisors is an integer number (9069159858444).

Almost surely, 2^{221204993433985} is an apocalyptic number.

It is an amenable number.

221204993433985 is a deficient number, since it is larger than the sum of its proper divisors (69008122036223).

221204993433985 is a wasteful number, since it uses less digits than its factorization.

221204993433985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2988225.

The product of its (nonzero) digits is 100776960, while the sum is 64.

The spelling of 221204993433985 in words is "two hundred twenty-one trillion, two hundred four billion, nine hundred ninety-three million, four hundred thirty-three thousand, nine hundred eighty-five".