40221165 has 16 divisors (see below), whose sum is σ = 64441728. Its totient is φ = 21422016.

The previous prime is 40221161. The next prime is 40221169. The reversal of 40221165 is 56112204.

It is an interprime number because it is at equal distance from previous prime (40221161) and next prime (40221169).

It is not a de Polignac number, because 40221165 - 2² = 40221161 is a prime.

It is a super-2 number, since 2×40221165² = 3235484227914450, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40221161) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13872 + ... + 16518.

It is an arithmetic number, because the mean of its divisors is an integer number (4027608).

Almost surely, 2^40221165 is an apocalyptic number.

It is an amenable number.

40221165 is a deficient number, since it is larger than the sum of its proper divisors (24220563).

40221165 is a wasteful number, since it uses less digits than its factorization.

40221165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3668.

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 40221165 is about 6342.0158467162. The cubic root of 40221165 is about 342.6243425842.

Adding to 40221165 its reverse (56112204), we get a palindrome (96333369).

The spelling of 40221165 in words is "forty million, two hundred twenty-one thousand, one hundred sixty-five".