134921 has 2 divisors, whose sum is σ = 134922. Its totient is φ = 134920.

The previous prime is 134917. The next prime is 134923. The reversal of 134921 is 129431.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 115600 + 19321 = 340^2 + 139^2 .

It is a cyclic number.

It is not a de Polignac number, because 134921 - 2² = 134917 is a prime.

Together with 134923, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 134893 and 134902.

It is not a weakly prime, because it can be changed into another prime (134923) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 67460 + 67461.

It is an arithmetic number, because the mean of its divisors is an integer number (67461).

2¹³⁴⁹²¹ is an apocalyptic number.

It is an amenable number.

134921 is a deficient number, since it is larger than the sum of its proper divisors (1).

134921 is an equidigital number, since it uses as much as digits as its factorization.

134921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 216, while the sum is 20.

The square root of 134921 is about 367.3159403021. The cubic root of 134921 is about 51.2892699219.

The spelling of 134921 in words is "one hundred thirty-four thousand, nine hundred twenty-one".