129995000321 has 2 divisors, whose sum is σ = 129995000322. Its totient is φ = 129995000320.

The previous prime is 129995000269. The next prime is 129995000407. The reversal of 129995000321 is 123000599921.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 102231109696 + 27763890625 = 319736^2 + 166625^2 .

It is a cyclic number.

It is not a de Polignac number, because 129995000321 - 2¹⁰ = 129994999297 is a prime.

It is a super-3 number, since 3×129995000321³ (a number of 34 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (129995000221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64997500160 + 64997500161.

It is an arithmetic number, because the mean of its divisors is an integer number (64997500161).

Almost surely, 2^129995000321 is an apocalyptic number.

It is an amenable number.

129995000321 is a deficient number, since it is larger than the sum of its proper divisors (1).

129995000321 is an equidigital number, since it uses as much as digits as its factorization.

129995000321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 43740, while the sum is 41.

The spelling of 129995000321 in words is "one hundred twenty-nine billion, nine hundred ninety-five million, three hundred twenty-one", and thus it is an aban number.