121215876993556 has 24 divisors (see below), whose sum is σ = 221615234333640. Its totient is φ = 57938623344000.

The previous prime is 121215876993493. The next prime is 121215876993577. The reversal of 121215876993556 is 655399678512121.

It can be written as a sum of positive squares in 4 ways, for example, as 35111953185156 + 86103923808400 = 5925534^2 + 9279220^2 .

It is a congruent 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, 5173079655 + ... + 5173103086.

It is an arithmetic number, because the mean of its divisors is an integer number (9233968097235).

Almost surely, 2^{121215876993556} is an apocalyptic number.

It is an amenable number.

121215876993556 is a deficient number, since it is larger than the sum of its proper divisors (100399357340084).

121215876993556 is a wasteful number, since it uses less digits than its factorization.

121215876993556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10346182875 (or 10346182873 counting only the distinct ones).

The product of its digits is 244944000, while the sum is 70.

The spelling of 121215876993556 in words is "one hundred twenty-one trillion, two hundred fifteen billion, eight hundred seventy-six million, nine hundred ninety-three thousand, five hundred fifty-six".