221564104 has 16 divisors (see below), whose sum is σ = 419547420. Its totient is φ = 109684800.

The previous prime is 221564093. The next prime is 221564113. The reversal of 221564104 is 401465122.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 219099204 + 2464900 = 14802^2 + 1570^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 136299 + ... + 137914.

Almost surely, 2^221564104 is an apocalyptic number.

It is an amenable number.

221564104 is a deficient number, since it is larger than the sum of its proper divisors (197983316).

221564104 is a wasteful number, since it uses less digits than its factorization.

221564104 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 274320 (or 274316 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 221564104 is about 14885.0295263395. The cubic root of 221564104 is about 605.1083329443.

The spelling of 221564104 in words is "two hundred twenty-one million, five hundred sixty-four thousand, one hundred four".