121219165 has 16 divisors (see below), whose sum is σ = 149422896. Its totient is φ = 94348800.

The previous prime is 121219073. The next prime is 121219169. The reversal of 121219165 is 561912121.

It can be written as a sum of positive squares in 8 ways, for example, as 636804 + 120582361 = 798^2 + 10981^2 .

It is not a de Polignac number, because 121219165 - 2⁷ = 121219037 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121219169) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 110359 + ... + 111451.

It is an arithmetic number, because the mean of its divisors is an integer number (9338931).

Almost surely, 2^121219165 is an apocalyptic number.

It is an amenable number.

121219165 is a deficient number, since it is larger than the sum of its proper divisors (28203731).

121219165 is a wasteful number, since it uses less digits than its factorization.

121219165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1680.

The product of its digits is 1080, while the sum is 28.

The square root of 121219165 is about 11009.9575385194. The cubic root of 121219165 is about 494.9071893470.

The spelling of 121219165 in words is "one hundred twenty-one million, two hundred nineteen thousand, one hundred sixty-five".