221061165 has 48 divisors (see below), whose sum is σ = 398372352. Its totient is φ = 104049792.

The previous prime is 221061161. The next prime is 221061167. The reversal of 221061165 is 561160122.

It is not a de Polignac number, because 221061165 - 2² = 221061161 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221061161) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 102084 + ... + 104226.

It is an arithmetic number, because the mean of its divisors is an integer number (8299424).

Almost surely, 2^221061165 is an apocalyptic number.

It is an amenable number.

221061165 is a deficient number, since it is larger than the sum of its proper divisors (177311187).

221061165 is a wasteful number, since it uses less digits than its factorization.

221061165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2210 (or 2187 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 24.

The square root of 221061165 is about 14868.1258065702. The cubic root of 221061165 is about 604.6501312497.

The spelling of 221061165 in words is "two hundred twenty-one million, sixty-one thousand, one hundred sixty-five".