121380817 has 4 divisors (see below), whose sum is σ = 121795380. Its totient is φ = 120966256.

The previous prime is 121380811. The next prime is 121380827. The reversal of 121380817 is 718083121.

It is a happy number.

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 113976976 + 7403841 = 10676^2 + 2721^2 .

It is a cyclic number.

It is not a de Polignac number, because 121380817 - 2¹⁹ = 120856529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121380811) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 206842 + ... + 207427.

It is an arithmetic number, because the mean of its divisors is an integer number (30448845).

Almost surely, 2^121380817 is an apocalyptic number.

It is an amenable number.

121380817 is a deficient number, since it is larger than the sum of its proper divisors (414563).

121380817 is an equidigital number, since it uses as much as digits as its factorization.

121380817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 414562.

The product of its (nonzero) digits is 2688, while the sum is 31.

The square root of 121380817 is about 11017.2962654183. The cubic root of 121380817 is about 495.1270863705.

The spelling of 121380817 in words is "one hundred twenty-one million, three hundred eighty thousand, eight hundred seventeen".