134443021 has 4 divisors (see below), whose sum is σ = 142351452. Its totient is φ = 126534592.

The previous prime is 134443013. The next prime is 134443037. The reversal of 134443021 is 120344431.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 120344431 = 313 ⋅384487.

It can be written as a sum of positive squares in 2 ways, for example, as 107868996 + 26574025 = 10386^2 + 5155^2 .

It is a cyclic number.

It is not a de Polignac number, because 134443021 - 2³ = 134443013 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 134442983 and 134443001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (134443051) 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, 3954190 + ... + 3954223.

It is an arithmetic number, because the mean of its divisors is an integer number (35587863).

Almost surely, 2^134443021 is an apocalyptic number.

It is an amenable number.

134443021 is a deficient number, since it is larger than the sum of its proper divisors (7908431).

134443021 is an equidigital number, since it uses as much as digits as its factorization.

134443021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7908430.

The product of its (nonzero) digits is 1152, while the sum is 22.

The square root of 134443021 is about 11594.9567053957. The cubic root of 134443021 is about 512.2863147242.

Adding to 134443021 its reverse (120344431), we get a palindrome (254787452).

The spelling of 134443021 in words is "one hundred thirty-four million, four hundred forty-three thousand, twenty-one".