121142165 has 4 divisors (see below), whose sum is σ = 145370604. Its totient is φ = 96913728.

The previous prime is 121142159. The next prime is 121142179. The reversal of 121142165 is 561241121.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 35450116 + 85692049 = 5954^2 + 9257^2 .

It is a cyclic number.

It is not a de Polignac number, because 121142165 - 2⁶ = 121142101 is a prime.

It is a super-3 number, since 3×121142165³ (a number of 25 digits) contains 333 as substring.

It is a Duffinian number.

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 121142165.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12114212 + ... + 12114221.

It is an arithmetic number, because the mean of its divisors is an integer number (36342651).

Almost surely, 2^121142165 is an apocalyptic number.

It is an amenable number.

121142165 is a deficient number, since it is larger than the sum of its proper divisors (24228439).

121142165 is an equidigital number, since it uses as much as digits as its factorization.

121142165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24228438.

The product of its digits is 480, while the sum is 23.

The square root of 121142165 is about 11006.4601484764. The cubic root of 121142165 is about 494.8023766433.

Adding to 121142165 its reverse (561241121), we get a palindrome (682383286).

The spelling of 121142165 in words is "one hundred twenty-one million, one hundred forty-two thousand, one hundred sixty-five".