121638738650267 has 4 divisors (see below), whose sum is σ = 121762481010000. Its totient is φ = 121514996290536.

The previous prime is 121638738650257. The next prime is 121638738650269. The reversal of 121638738650267 is 762056837836121.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 121638738650267 - 2⁶ = 121638738650203 is a prime.

It is a super-3 number, since 3×121638738650267³ (a number of 43 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121638738650269) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 61871178392 + ... + 61871180357.

It is an arithmetic number, because the mean of its divisors is an integer number (30440620252500).

Almost surely, 2^{121638738650267} is an apocalyptic number.

121638738650267 is a deficient number, since it is larger than the sum of its proper divisors (123742359733).

121638738650267 is an equidigital number, since it uses as much as digits as its factorization.

121638738650267 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123742359732.

The product of its (nonzero) digits is 121927680, while the sum is 65.

The spelling of 121638738650267 in words is "one hundred twenty-one trillion, six hundred thirty-eight billion, seven hundred thirty-eight million, six hundred fifty thousand, two hundred sixty-seven".