121334440987 has 4 divisors (see below), whose sum is σ = 121335291000. Its totient is φ = 121333590976.

The previous prime is 121334440957. The next prime is 121334441087. The reversal of 121334440987 is 789044433121.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 789044433121 = 7 ⋅112720633303.

It is a cyclic number.

It is not a de Polignac number, because 121334440987 - 2²⁷ = 121200223259 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121334440957) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 152758 + ... + 515755.

It is an arithmetic number, because the mean of its divisors is an integer number (30333822750).

Almost surely, 2^121334440987 is an apocalyptic number.

121334440987 is a deficient number, since it is larger than the sum of its proper divisors (850013).

121334440987 is an equidigital number, since it uses as much as digits as its factorization.

121334440987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 850012.

The product of its (nonzero) digits is 580608, while the sum is 46.

The spelling of 121334440987 in words is "one hundred twenty-one billion, three hundred thirty-four million, four hundred forty thousand, nine hundred eighty-seven".