121430865 has 16 divisors (see below), whose sum is σ = 195530688. Its totient is φ = 64349376.

The previous prime is 121430863. The next prime is 121430893. The reversal of 121430865 is 568034121.

It is not a de Polignac number, because 121430865 - 2¹ = 121430863 is a prime.

It is not an unprimeable number, because it can be changed into a prime (121430861) 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, 23427 + ... + 28136.

It is an arithmetic number, because the mean of its divisors is an integer number (12220668).

Almost surely, 2^121430865 is an apocalyptic number.

121430865 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

121430865 is a deficient number, since it is larger than the sum of its proper divisors (74099823).

121430865 is a wasteful number, since it uses less digits than its factorization.

121430865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51728.

The product of its (nonzero) digits is 5760, while the sum is 30.

The square root of 121430865 is about 11019.5673690032. The cubic root of 121430865 is about 495.1951276421.

Adding to 121430865 its reverse (568034121), we get a palindrome (689464986).

The spelling of 121430865 in words is "one hundred twenty-one million, four hundred thirty thousand, eight hundred sixty-five".