221769009 has 120 divisors (see below), whose sum is σ = 438318144. Its totient is φ = 108475200.

The previous prime is 221768957. The next prime is 221769011. The reversal of 221769009 is 900967122.

It is not a de Polignac number, because 221769009 - 2⁸ = 221768753 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221769209) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 119 ways as a sum of consecutive naturals, for example, 5993739 + ... + 5993775.

Almost surely, 2^221769009 is an apocalyptic number.

It is an amenable number.

221769009 is a deficient number, since it is larger than the sum of its proper divisors (216549135).

221769009 is a wasteful number, since it uses less digits than its factorization.

221769009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129 (or 89 counting only the distinct ones).

The product of its (nonzero) digits is 13608, while the sum is 36.

The square root of 221769009 is about 14891.9108579121. The cubic root of 221769009 is about 605.2948124898.

The spelling of 221769009 in words is "two hundred twenty-one million, seven hundred sixty-nine thousand, nine".