129203189121 has 8 divisors (see below), whose sum is σ = 172668774880. Its totient is φ = 85936531392.

The previous prime is 129203189119. The next prime is 129203189189. The reversal of 129203189121 is 121981302921.

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

It is not a de Polignac number, because 129203189121 - 2¹ = 129203189119 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 129203189121.

It is not an unprimeable number, because it can be changed into a prime (129203189111) 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, 49730491 + ... + 49733088.

It is an arithmetic number, because the mean of its divisors is an integer number (21583596860).

Almost surely, 2^129203189121 is an apocalyptic number.

It is an amenable number.

129203189121 is a deficient number, since it is larger than the sum of its proper divisors (43465585759).

129203189121 is an equidigital number, since it uses as much as digits as its factorization.

129203189121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99464015.

The product of its (nonzero) digits is 15552, while the sum is 39.

The spelling of 129203189121 in words is "one hundred twenty-nine billion, two hundred three million, one hundred eighty-nine thousand, one hundred twenty-one".