121609974109 has 16 divisors (see below), whose sum is σ = 134979601792. Its totient is φ = 108835368768.

The previous prime is 121609974041. The next prime is 121609974131. The reversal of 121609974109 is 901479906121.

It is a cyclic number.

It is not a de Polignac number, because 121609974109 - 2⁷ = 121609973981 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 (121609974179) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 310569 + ... + 582814.

It is an arithmetic number, because the mean of its divisors is an integer number (8436225112).

Almost surely, 2^121609974109 is an apocalyptic number.

It is an amenable number.

121609974109 is a deficient number, since it is larger than the sum of its proper divisors (13369627683).

121609974109 is a wasteful number, since it uses less digits than its factorization.

121609974109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 893716.

The product of its (nonzero) digits is 244944, while the sum is 49.

The spelling of 121609974109 in words is "one hundred twenty-one billion, six hundred nine million, nine hundred seventy-four thousand, one hundred nine".