134821 has 4 divisors (see below), whose sum is σ = 139500. Its totient is φ = 130144.

The previous prime is 134807. The next prime is 134837. The reversal of 134821 is 128431.

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 108900 + 25921 = 330^2 + 161^2 .

It is a cyclic number.

It is not a de Polignac number, because 134821 - 2⁵ = 134789 is a prime.

It is a deceptive number, since it divides R₁₃₄₈₂₀.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (134851) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2296 + ... + 2353.

It is an arithmetic number, because the mean of its divisors is an integer number (34875).

2¹³⁴⁸²¹ is an apocalyptic number.

It is an amenable number.

134821 is a deficient number, since it is larger than the sum of its proper divisors (4679).

134821 is an equidigital number, since it uses as much as digits as its factorization.

134821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4678.

The product of its digits is 192, while the sum is 19.

The square root of 134821 is about 367.1797924723. The cubic root of 134821 is about 51.2765953576.

It can be divided in two parts, 1348 and 21, that added together give a square (1369 = 37²).

The spelling of 134821 in words is "one hundred thirty-four thousand, eight hundred twenty-one".