121117356521 has 16 divisors (see below), whose sum is σ = 139457455104. Its totient is φ = 103038387984.

The previous prime is 121117356517. The next prime is 121117356527. The reversal of 121117356521 is 125653711121.

It is not a de Polignac number, because 121117356521 - 2² = 121117356517 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121117356527) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 776330 + ... + 919196.

It is an arithmetic number, because the mean of its divisors is an integer number (8716090944).

Almost surely, 2^121117356521 is an apocalyptic number.

It is an amenable number.

121117356521 is a deficient number, since it is larger than the sum of its proper divisors (18340098583).

121117356521 is a wasteful number, since it uses less digits than its factorization.

121117356521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143780.

The product of its digits is 12600, while the sum is 35.

The spelling of 121117356521 in words is "one hundred twenty-one billion, one hundred seventeen million, three hundred fifty-six thousand, five hundred twenty-one".