135225421 has 4 divisors (see below), whose sum is σ = 138523644. Its totient is φ = 131927200.

The previous prime is 135225403. The next prime is 135225437. The reversal of 135225421 is 124522531.

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 12348196 + 122877225 = 3514^2 + 11085^2 .

It is a cyclic number.

It is not a de Polignac number, because 135225421 - 2¹¹ = 135223373 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 (135225481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1649050 + ... + 1649131.

It is an arithmetic number, because the mean of its divisors is an integer number (34630911).

Almost surely, 2^135225421 is an apocalyptic number.

It is an amenable number.

135225421 is a deficient number, since it is larger than the sum of its proper divisors (3298223).

135225421 is an equidigital number, since it uses as much as digits as its factorization.

135225421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3298222.

The product of its digits is 2400, while the sum is 25.

The square root of 135225421 is about 11628.6465678513. The cubic root of 135225421 is about 513.2781544764.

Adding to 135225421 its reverse (124522531), we get a palindrome (259747952).

The spelling of 135225421 in words is "one hundred thirty-five million, two hundred twenty-five thousand, four hundred twenty-one".