221274609 has 16 divisors (see below), whose sum is σ = 299531520. Its totient is φ = 145283600.

The previous prime is 221274593. The next prime is 221274617. The reversal of 221274609 is 906472122.

It is a cyclic number.

It is not a de Polignac number, because 221274609 - 2⁴ = 221274593 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 221274609.

It is not an unprimeable number, because it can be changed into a prime (221274659) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 55534 + ... + 59384.

It is an arithmetic number, because the mean of its divisors is an integer number (18720720).

Almost surely, 2^221274609 is an apocalyptic number.

It is an amenable number.

221274609 is a deficient number, since it is larger than the sum of its proper divisors (78256911).

221274609 is a wasteful number, since it uses less digits than its factorization.

221274609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4140.

The product of its (nonzero) digits is 12096, while the sum is 33.

The square root of 221274609 is about 14875.3019801280. The cubic root of 221274609 is about 604.8446738289.

The spelling of 221274609 in words is "two hundred twenty-one million, two hundred seventy-four thousand, six hundred nine".