129021517 has 8 divisors (see below), whose sum is σ = 136726272. Its totient is φ = 121329600.

The previous prime is 129021511. The next prime is 129021523. The reversal of 129021517 is 715120921.

It is an interprime number because it is at equal distance from previous prime (129021511) and next prime (129021523).

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 129021517 - 2¹¹ = 129019469 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 (129021511) 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, 24292 + ... + 29122.

It is an arithmetic number, because the mean of its divisors is an integer number (17090784).

Almost surely, 2^129021517 is an apocalyptic number.

129021517 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

129021517 is a deficient number, since it is larger than the sum of its proper divisors (7704755).

129021517 is a wasteful number, since it uses less digits than its factorization.

129021517 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6419.

The product of its (nonzero) digits is 1260, while the sum is 28.

The square root of 129021517 is about 11358.7638852122. The cubic root of 129021517 is about 505.3055263233.

The spelling of 129021517 in words is "one hundred twenty-nine million, twenty-one thousand, five hundred seventeen".