221334765 has 16 divisors (see below), whose sum is σ = 355920000. Its totient is φ = 117450432.

The previous prime is 221334749. The next prime is 221334791. The reversal of 221334765 is 567433122.

It is not a de Polignac number, because 221334765 - 2⁴ = 221334749 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34090 + ... + 40059.

It is an arithmetic number, because the mean of its divisors is an integer number (22245000).

Almost surely, 2^221334765 is an apocalyptic number.

It is an amenable number.

221334765 is a deficient number, since it is larger than the sum of its proper divisors (134585235).

221334765 is a wasteful number, since it uses less digits than its factorization.

221334765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74356.

The product of its digits is 30240, while the sum is 33.

The square root of 221334765 is about 14877.3238520911. The cubic root of 221334765 is about 604.8994801465.

Adding to 221334765 its reverse (567433122), we get a palindrome (788767887).

The spelling of 221334765 in words is "two hundred twenty-one million, three hundred thirty-four thousand, seven hundred sixty-five".