82129836121 has 4 divisors (see below), whose sum is σ = 82776527872. Its totient is φ = 81483144372.

The previous prime is 82129836073. The next prime is 82129836197. The reversal of 82129836121 is 12163892128.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 82129836121 - 2⁹ = 82129835609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (82129836721) 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 3 ways as a sum of consecutive naturals, for example, 323345685 + ... + 323345938.

It is an arithmetic number, because the mean of its divisors is an integer number (20694131968).

Almost surely, 2^82129836121 is an apocalyptic number.

It is an amenable number.

82129836121 is a deficient number, since it is larger than the sum of its proper divisors (646691751).

82129836121 is a wasteful number, since it uses less digits than its factorization.

82129836121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 646691750.

The product of its digits is 82944, while the sum is 43.

The spelling of 82129836121 in words is "eighty-two billion, one hundred twenty-nine million, eight hundred thirty-six thousand, one hundred twenty-one".