129321707 has 4 divisors (see below), whose sum is σ = 129998976. Its totient is φ = 128644440.

The previous prime is 129321691. The next prime is 129321721. The reversal of 129321707 is 707123921.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 129321707 - 2⁴ = 129321691 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (129321767) 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 3 ways as a sum of consecutive naturals, for example, 338348 + ... + 338729.

It is an arithmetic number, because the mean of its divisors is an integer number (32499744).

Almost surely, 2^129321707 is an apocalyptic number.

129321707 is a deficient number, since it is larger than the sum of its proper divisors (677269).

129321707 is an equidigital number, since it uses as much as digits as its factorization.

129321707 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 677268.

The product of its (nonzero) digits is 5292, while the sum is 32.

The square root of 129321707 is about 11371.9702338689. The cubic root of 129321707 is about 505.6971152073.

The spelling of 129321707 in words is "one hundred twenty-nine million, three hundred twenty-one thousand, seven hundred seven".