121555323730415 has 8 divisors (see below), whose sum is σ = 146185570948560. Its totient is φ = 97031470669632.

The previous prime is 121555323730349. The next prime is 121555323730457. The reversal of 121555323730415 is 514037323555121.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 121555323730415 - 2⁴⁴ = 103963137685999 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 121555323730415.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26598536825 + ... + 26598541394.

It is an arithmetic number, because the mean of its divisors is an integer number (18273196368570).

Almost surely, 2^{121555323730415} is an apocalyptic number.

121555323730415 is a deficient number, since it is larger than the sum of its proper divisors (24630247218145).

121555323730415 is an equidigital number, since it uses as much as digits as its factorization.

121555323730415 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53197078681.

The product of its (nonzero) digits is 1890000, while the sum is 47.

The spelling of 121555323730415 in words is "one hundred twenty-one trillion, five hundred fifty-five billion, three hundred twenty-three million, seven hundred thirty thousand, four hundred fifteen".