221226165 has 12 divisors (see below), whose sum is σ = 383458764. Its totient is φ = 117987264.

The previous prime is 221226113. The next prime is 221226169. The reversal of 221226165 is 561622122.

221226165 is a `hidden beast` number, since 2 + 21 + 22 + 616 + 5 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 75637809 + 145588356 = 8697^2 + 12066^2 .

It is not a de Polignac number, because 221226165 - 2⁸ = 221225909 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221226169) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2458024 + ... + 2458113.

It is an arithmetic number, because the mean of its divisors is an integer number (31954897).

Almost surely, 2^221226165 is an apocalyptic number.

It is an amenable number.

221226165 is a deficient number, since it is larger than the sum of its proper divisors (162232599).

221226165 is a wasteful number, since it uses less digits than its factorization.

221226165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4916148 (or 4916145 counting only the distinct ones).

The product of its digits is 2880, while the sum is 27.

The square root of 221226165 is about 14873.6735543039. The cubic root of 221226165 is about 604.8005307404.

Adding to 221226165 its reverse (561622122), we get a palindrome (782848287).

The spelling of 221226165 in words is "two hundred twenty-one million, two hundred twenty-six thousand, one hundred sixty-five".