129670921 has 8 divisors (see below), whose sum is σ = 131760000. Its totient is φ = 127589280.

The previous prime is 129670909. The next prime is 129670949. The reversal of 129670921 is 129076921.

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 129670921 - 2⁵ = 129670889 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (129670721) 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, 41005 + ... + 44053.

It is an arithmetic number, because the mean of its divisors is an integer number (16470000).

Almost surely, 2^129670921 is an apocalyptic number.

It is an amenable number.

129670921 is a deficient number, since it is larger than the sum of its proper divisors (2089079).

129670921 is an equidigital number, since it uses as much as digits as its factorization.

129670921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3719.

The product of its (nonzero) digits is 13608, while the sum is 37.

The square root of 129670921 is about 11387.3140379986. The cubic root of 129670921 is about 506.1518926689.

The spelling of 129670921 in words is "one hundred twenty-nine million, six hundred seventy thousand, nine hundred twenty-one".