129212060885 has 4 divisors (see below), whose sum is σ = 155054473068. Its totient is φ = 103369648704.

The previous prime is 129212060843. The next prime is 129212060891. The reversal of 129212060885 is 588060212921.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 588060212921 = 361013 ⋅1628917.

It can be written as a sum of positive squares in 2 ways, for example, as 31442027761 + 97770033124 = 177319^2 + 312682^2 .

It is a cyclic number.

It is not a de Polignac number, because 129212060885 - 2⁸ = 129212060629 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 12921206084 + ... + 12921206093.

It is an arithmetic number, because the mean of its divisors is an integer number (38763618267).

Almost surely, 2^129212060885 is an apocalyptic number.

It is an amenable number.

129212060885 is a deficient number, since it is larger than the sum of its proper divisors (25842412183).

129212060885 is an equidigital number, since it uses as much as digits as its factorization.

129212060885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25842412182.

The product of its (nonzero) digits is 138240, while the sum is 44.

The spelling of 129212060885 in words is "one hundred twenty-nine billion, two hundred twelve million, sixty thousand, eight hundred eighty-five".