134811871021 has 4 divisors (see below), whose sum is σ = 134848578172. Its totient is φ = 134775163872.

The previous prime is 134811871009. The next prime is 134811871039. The reversal of 134811871021 is 120178118431.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 6787452996 + 128024418025 = 82386^2 + 357805^2 .

It is a cyclic number.

It is not a de Polignac number, because 134811871021 - 2⁹ = 134811870509 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 (134811871001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18348066 + ... + 18355411.

It is an arithmetic number, because the mean of its divisors is an integer number (33712144543).

Almost surely, 2^134811871021 is an apocalyptic number.

It is an amenable number.

134811871021 is a deficient number, since it is larger than the sum of its proper divisors (36707151).

134811871021 is an equidigital number, since it uses as much as digits as its factorization.

134811871021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36707150.

The product of its (nonzero) digits is 10752, while the sum is 37.

Adding to 134811871021 its reverse (120178118431), we get a palindrome (254989989452).

The spelling of 134811871021 in words is "one hundred thirty-four billion, eight hundred eleven million, eight hundred seventy-one thousand, twenty-one".