221251165 has 8 divisors (see below), whose sum is σ = 267412320. Its totient is φ = 175726992.

The previous prime is 221251159. The next prime is 221251169. The reversal of 221251165 is 561152122.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 221251165 - 2⁵ = 221251133 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221251169) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 158479 + ... + 159868.

It is an arithmetic number, because the mean of its divisors is an integer number (33426540).

Almost surely, 2^221251165 is an apocalyptic number.

It is an amenable number.

221251165 is a deficient number, since it is larger than the sum of its proper divisors (46161155).

221251165 is a wasteful number, since it uses less digits than its factorization.

221251165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 318491.

The product of its digits is 1200, while the sum is 25.

The square root of 221251165 is about 14874.5139416386. The cubic root of 221251165 is about 604.8233120176.

The spelling of 221251165 in words is "two hundred twenty-one million, two hundred fifty-one thousand, one hundred sixty-five".