129355583021 has 8 divisors (see below), whose sum is σ = 147842334720. Its totient is φ = 110870677008.

The previous prime is 129355583003. The next prime is 129355583059. The reversal of 129355583021 is 120385553921.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 129355583021 - 2⁶ = 129355582957 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129355583221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 307826 + ... + 594531.

It is an arithmetic number, because the mean of its divisors is an integer number (18480291840).

Almost surely, 2^129355583021 is an apocalyptic number.

It is an amenable number.

129355583021 is a deficient number, since it is larger than the sum of its proper divisors (18486751699).

129355583021 is an equidigital number, since it uses as much as digits as its factorization.

129355583021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 922843.

The product of its (nonzero) digits is 324000, while the sum is 44.

The spelling of 129355583021 in words is "one hundred twenty-nine billion, three hundred fifty-five million, five hundred eighty-three thousand, twenty-one".