121687487129 has 8 divisors (see below), whose sum is σ = 131073835200. Its totient is φ = 112304820816.

The previous prime is 121687487113. The next prime is 121687487161. The reversal of 121687487129 is 921784786121.

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

It is a cyclic number.

It is not a de Polignac number, because 121687487129 - 2⁴ = 121687487113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121687481129) 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, 851597 + ... + 984170.

It is an arithmetic number, because the mean of its divisors is an integer number (16384229400).

Almost surely, 2^121687487129 is an apocalyptic number.

It is an amenable number.

121687487129 is a deficient number, since it is larger than the sum of its proper divisors (9386348071).

121687487129 is a wasteful number, since it uses less digits than its factorization.

121687487129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1840879.

The product of its digits is 2709504, while the sum is 56.

The spelling of 121687487129 in words is "one hundred twenty-one billion, six hundred eighty-seven million, four hundred eighty-seven thousand, one hundred twenty-nine".