121638738650198 has 64 divisors (see below), whose sum is σ = 232844718002688. Its totient is φ = 46274819512320.

The previous prime is 121638738650173. The next prime is 121638738650203. The reversal of 121638738650198 is 891056837836121.

It is a super-2 number, since 2×121638738650198² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 17845436 + ... + 23700992.

It is an arithmetic number, because the mean of its divisors is an integer number (3638198718792).

Almost surely, 2^{121638738650198} is an apocalyptic number.

121638738650198 is a deficient number, since it is larger than the sum of its proper divisors (111205979352490).

121638738650198 is a wasteful number, since it uses less digits than its factorization.

121638738650198 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5858757.

The product of its (nonzero) digits is 104509440, while the sum is 68.

The spelling of 121638738650198 in words is "one hundred twenty-one trillion, six hundred thirty-eight billion, seven hundred thirty-eight million, six hundred fifty thousand, one hundred ninety-eight".