121296868729 has 9 divisors (see below), whose sum is σ = 123408499333. Its totient is φ = 119220789532.

The previous prime is 121296868687. The next prime is 121296868739. The reversal of 121296868729 is 927868692121.

The square root of 121296868729 is 348277.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 121296868729 - 2⁷ = 121296868601 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121296868739) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 20545392 + ... + 20551294.

Almost surely, 2^121296868729 is an apocalyptic number.

121296868729 is the 348277-th square number.

121296868729 is the 174139-th centered octagonal number.

It is an amenable number.

121296868729 is a deficient number, since it is larger than the sum of its proper divisors (2111630604).

121296868729 is an frugal number, since it uses more digits than its factorization.

121296868729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11924 (or 5962 counting only the distinct ones).

The product of its digits is 10450944, while the sum is 61.

It can be divided in two parts, 121296 and 868729, that added together give a square (990025 = 995²).

The spelling of 121296868729 in words is "one hundred twenty-one billion, two hundred ninety-six million, eight hundred sixty-eight thousand, seven hundred twenty-nine".