121299865 has 8 divisors (see below), whose sum is σ = 146365128. Its totient is φ = 96503040.

The previous prime is 121299851. The next prime is 121299883. The reversal of 121299865 is 568992121.

It can be written as a sum of positive squares in 4 ways, for example, as 35721 + 121264144 = 189^2 + 11012^2 .

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

It is a de Polignac number, because none of the positive numbers 2^k-121299865 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 66112 + ... + 67921.

It is an arithmetic number, because the mean of its divisors is an integer number (18295641).

Almost surely, 2^121299865 is an apocalyptic number.

It is an amenable number.

121299865 is a deficient number, since it is larger than the sum of its proper divisors (25065263).

121299865 is a wasteful number, since it uses less digits than its factorization.

121299865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134219.

The product of its digits is 77760, while the sum is 43.

The square root of 121299865 is about 11013.6217930343. The cubic root of 121299865 is about 495.0169908802.

The spelling of 121299865 in words is "one hundred twenty-one million, two hundred ninety-nine thousand, eight hundred sixty-five".