121638812413 has 16 divisors (see below), whose sum is σ = 124755973056. Its totient is φ = 118535155200.

The previous prime is 121638812401. The next prime is 121638812431. The reversal of 121638812413 is 314218836121.

It is a cyclic number.

It is not a de Polignac number, because 121638812413 - 2⁹ = 121638811901 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 (121638812453) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 45779181 + ... + 45781837.

It is an arithmetic number, because the mean of its divisors is an integer number (7797248316).

Almost surely, 2^121638812413 is an apocalyptic number.

It is an amenable number.

121638812413 is a deficient number, since it is larger than the sum of its proper divisors (3117160643).

121638812413 is a wasteful number, since it uses less digits than its factorization.

121638812413 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4764.

The product of its digits is 55296, while the sum is 40.

The spelling of 121638812413 in words is "one hundred twenty-one billion, six hundred thirty-eight million, eight hundred twelve thousand, four hundred thirteen".