134213521 has 8 divisors (see below), whose sum is σ = 153040104. Its totient is φ = 116601600.

The previous prime is 134213507. The next prime is 134213531. The reversal of 134213521 is 125312431.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1296 + 134212225 = 36^2 + 11585^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 134213521 - 2⁵ = 134213489 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 134213492 and 134213501.

It is not an unprimeable number, because it can be changed into a prime (134213531) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 303430 + ... + 303871.

It is an arithmetic number, because the mean of its divisors is an integer number (19130013).

Almost surely, 2^134213521 is an apocalyptic number.

It is an amenable number.

134213521 is a deficient number, since it is larger than the sum of its proper divisors (18826583).

134213521 is a wasteful number, since it uses less digits than its factorization.

134213521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 607331.

The product of its digits is 720, while the sum is 22.

The square root of 134213521 is about 11585.0559342629. The cubic root of 134213521 is about 511.9946504670.

Adding to 134213521 its reverse (125312431), we get a palindrome (259525952).

The spelling of 134213521 in words is "one hundred thirty-four million, two hundred thirteen thousand, five hundred twenty-one".