121640256115 has 16 divisors (see below), whose sum is σ = 170889727680. Its totient is φ = 81376058880.

The previous prime is 121640256103. The next prime is 121640256131. The reversal of 121640256115 is 511652046121.

It is not a de Polignac number, because 121640256115 - 2⁷ = 121640255987 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 42381930 + ... + 42384799.

It is an arithmetic number, because the mean of its divisors is an integer number (10680607980).

Almost surely, 2^121640256115 is an apocalyptic number.

121640256115 is a deficient number, since it is larger than the sum of its proper divisors (49249471565).

121640256115 is an equidigital number, since it uses as much as digits as its factorization.

121640256115 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84766782.

The product of its (nonzero) digits is 14400, while the sum is 34.

The spelling of 121640256115 in words is "one hundred twenty-one billion, six hundred forty million, two hundred fifty-six thousand, one hundred fifteen".