121658843287 has 16 divisors (see below), whose sum is σ = 126550605600. Its totient is φ = 116886407040.

The previous prime is 121658843279. The next prime is 121658843347. The reversal of 121658843287 is 782348856121.

It is a cyclic number.

It is not a de Polignac number, because 121658843287 - 2³ = 121658843279 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 (121658843227) 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 15 ways as a sum of consecutive naturals, for example, 457389 + ... + 672697.

It is an arithmetic number, because the mean of its divisors is an integer number (7909412850).

Almost surely, 2^121658843287 is an apocalyptic number.

121658843287 is a deficient number, since it is larger than the sum of its proper divisors (4891762313).

121658843287 is a wasteful number, since it uses less digits than its factorization.

121658843287 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 215586.

The product of its digits is 5160960, while the sum is 55.

The spelling of 121658843287 in words is "one hundred twenty-one billion, six hundred fifty-eight million, eight hundred forty-three thousand, two hundred eighty-seven".