129446800321 has 2 divisors, whose sum is σ = 129446800322. Its totient is φ = 129446800320.

The previous prime is 129446800313. The next prime is 129446800363. The reversal of 129446800321 is 123008644921.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 126718200625 + 2728599696 = 355975^2 + 52236^2 .

It is a cyclic number.

It is not a de Polignac number, because 129446800321 - 2³ = 129446800313 is a prime.

It is a super-2 number, since 2×129446800321² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (129446800121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64723400160 + 64723400161.

It is an arithmetic number, because the mean of its divisors is an integer number (64723400161).

Almost surely, 2^129446800321 is an apocalyptic number.

It is an amenable number.

129446800321 is a deficient number, since it is larger than the sum of its proper divisors (1).

129446800321 is an equidigital number, since it uses as much as digits as its factorization.

129446800321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 82944, while the sum is 40.

The spelling of 129446800321 in words is "one hundred twenty-nine billion, four hundred forty-six million, eight hundred thousand, three hundred twenty-one".