121539909935121 has 8 divisors (see below), whose sum is σ = 162055235365920. Its totient is φ = 81025595563872.

The previous prime is 121539909935071. The next prime is 121539909935153.

It is a happy number.

121539909935121 is nontrivially palindromic in base 10.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 121539909935121 - 2²⁶ = 121539842826257 is a prime.

It is a super-3 number, since 3×121539909935121³ (a number of 43 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (121539909935161) 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 7 ways as a sum of consecutive naturals, for example, 252484351 + ... + 252965268.

It is an arithmetic number, because the mean of its divisors is an integer number (20256904420740).

Almost surely, 2^{121539909935121} is an apocalyptic number.

It is an amenable number.

121539909935121 is a deficient number, since it is larger than the sum of its proper divisors (40515325430799).

121539909935121 is an equidigital number, since it uses as much as digits as its factorization.

121539909935121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 505529775.

The product of its (nonzero) digits is 5904900, while the sum is 60.

The spelling of 121539909935121 in words is "one hundred twenty-one trillion, five hundred thirty-nine billion, nine hundred nine million, nine hundred thirty-five thousand, one hundred twenty-one".