121555379317 has 8 divisors (see below), whose sum is σ = 128960537600. Its totient is φ = 114250971744.

The previous prime is 121555379291. The next prime is 121555379321. The reversal of 121555379317 is 713973555121.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121555379317 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 (121555371317) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25185192 + ... + 25190017.

It is an arithmetic number, because the mean of its divisors is an integer number (16120067200).

Almost surely, 2^121555379317 is an apocalyptic number.

It is an amenable number.

121555379317 is a deficient number, since it is larger than the sum of its proper divisors (7405158283).

121555379317 is a wasteful number, since it uses less digits than its factorization.

121555379317 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50375355.

The product of its digits is 992250, while the sum is 49.

The spelling of 121555379317 in words is "one hundred twenty-one billion, five hundred fifty-five million, three hundred seventy-nine thousand, three hundred seventeen".