129010321 has 12 divisors (see below), whose sum is σ = 144487476. Its totient is φ = 115063520.

The previous prime is 129010319. The next prime is 129010327. The reversal of 129010321 is 123010921.

It can be written as a sum of positive squares in 2 ways, for example, as 59120721 + 69889600 = 7689^2 + 8360^2 .

It is not a de Polignac number, because 129010321 - 2¹ = 129010319 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 (129010327) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3646 + ... + 16471.

It is an arithmetic number, because the mean of its divisors is an integer number (12040623).

Almost surely, 2^129010321 is an apocalyptic number.

129010321 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

129010321 is a deficient number, since it is larger than the sum of its proper divisors (15477155).

129010321 is a wasteful number, since it uses less digits than its factorization.

129010321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20192 (or 20181 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 19.

The square root of 129010321 is about 11358.2710392031. The cubic root of 129010321 is about 505.2909097320.

It can be divided in two parts, 1290 and 10321, that added together give a palindrome (11611).

The spelling of 129010321 in words is "one hundred twenty-nine million, ten thousand, three hundred twenty-one".