221142165 has 8 divisors (see below), whose sum is σ = 353827488. Its totient is φ = 117942480.

The previous prime is 221142073. The next prime is 221142169. The reversal of 221142165 is 561241122.

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

It is not a de Polignac number, because 221142165 - 2¹⁶ = 221076629 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221142169) 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, 7371391 + ... + 7371420.

It is an arithmetic number, because the mean of its divisors is an integer number (44228436).

Almost surely, 2^221142165 is an apocalyptic number.

It is an amenable number.

221142165 is a deficient number, since it is larger than the sum of its proper divisors (132685323).

221142165 is a wasteful number, since it uses less digits than its factorization.

221142165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14742819.

The product of its digits is 960, while the sum is 24.

The square root of 221142165 is about 14870.8495049879. The cubic root of 221142165 is about 604.7239730753.

Adding to 221142165 its reverse (561241122), we get a palindrome (782383287).

The spelling of 221142165 in words is "two hundred twenty-one million, one hundred forty-two thousand, one hundred sixty-five".