121689998129 has 8 divisors (see below), whose sum is σ = 139076857920. Its totient is φ = 104303781936.

The previous prime is 121689998123. The next prime is 121689998137. The reversal of 121689998129 is 921899986121.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121689998129 is a prime.

It is not an unprimeable number, because it can be changed into a prime (121689998123) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 354227 + ... + 607335.

It is an arithmetic number, because the mean of its divisors is an integer number (17384607240).

Almost surely, 2^121689998129 is an apocalyptic number.

It is an amenable number.

121689998129 is a deficient number, since it is larger than the sum of its proper divisors (17386859791).

121689998129 is an equidigital number, since it uses as much as digits as its factorization.

121689998129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 321799.

The product of its digits is 10077696, while the sum is 65.

The spelling of 121689998129 in words is "one hundred twenty-one billion, six hundred eighty-nine million, nine hundred ninety-eight thousand, one hundred twenty-nine".