121635745399 has 24 divisors (see below), whose sum is σ = 149859694080. Its totient is φ = 98098914816.

The previous prime is 121635745391. The next prime is 121635745453. The reversal of 121635745399 is 993547536121.

It is not a de Polignac number, because 121635745399 - 2³ = 121635745391 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 (121635745391) 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 23 ways as a sum of consecutive naturals, for example, 3286107 + ... + 3322915.

It is an arithmetic number, because the mean of its divisors is an integer number (6244153920).

Almost surely, 2^121635745399 is an apocalyptic number.

121635745399 is a deficient number, since it is larger than the sum of its proper divisors (28223948681).

121635745399 is a wasteful number, since it uses less digits than its factorization.

121635745399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40807 (or 40800 counting only the distinct ones).

The product of its digits is 6123600, while the sum is 55.

The spelling of 121635745399 in words is "one hundred twenty-one billion, six hundred thirty-five million, seven hundred forty-five thousand, three hundred ninety-nine".