121223165 has 16 divisors (see below), whose sum is σ = 168977280. Its totient is φ = 81760320.

The previous prime is 121223159. The next prime is 121223197. The reversal of 121223165 is 561322121.

It is not a de Polignac number, because 121223165 - 2¹⁰ = 121222141 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 121223165.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26255 + ... + 30524.

It is an arithmetic number, because the mean of its divisors is an integer number (10561080).

Almost surely, 2^121223165 is an apocalyptic number.

It is an amenable number.

121223165 is a deficient number, since it is larger than the sum of its proper divisors (47754115).

121223165 is an equidigital number, since it uses as much as digits as its factorization.

121223165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56852.

The product of its digits is 720, while the sum is 23.

The square root of 121223165 is about 11010.1391907641. The cubic root of 121223165 is about 494.9126329499.

Adding to 121223165 its reverse (561322121), we get a palindrome (682545286).

The spelling of 121223165 in words is "one hundred twenty-one million, two hundred twenty-three thousand, one hundred sixty-five".