121320311331987 has 48 divisors (see below), whose sum is σ = 187322873826816. Its totient is φ = 75475434672000.

The previous prime is 121320311331899. The next prime is 121320311332013. The reversal of 121320311331987 is 789133113023121.

121320311331987 is a `hidden beast` number, since 1 + 2 + 1 + 320 + 3 + 1 + 1 + 3 + 319 + 8 + 7 = 666.

It is not a de Polignac number, because 121320311331987 - 2²⁰ = 121320310283411 is a prime.

It is a super-3 number, since 3×121320311331987³ (a number of 43 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not an unprimeable number, because it can be changed into a prime (121320311330987) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 745170562 + ... + 745333352.

It is an arithmetic number, because the mean of its divisors is an integer number (3902559871392).

Almost surely, 2^{121320311331987} is an apocalyptic number.

121320311331987 is a deficient number, since it is larger than the sum of its proper divisors (66002562494829).

121320311331987 is a wasteful number, since it uses less digits than its factorization.

121320311331987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 250672 (or 250669 counting only the distinct ones).

The product of its (nonzero) digits is 163296, while the sum is 45.

The spelling of 121320311331987 in words is "one hundred twenty-one trillion, three hundred twenty billion, three hundred eleven million, three hundred thirty-one thousand, nine hundred eighty-seven".