135421225 has 12 divisors (see below), whose sum is σ = 170770320. Its totient is φ = 106499600.

The previous prime is 135421193. The next prime is 135421229. The reversal of 135421225 is 522124531.

It is not a de Polignac number, because 135421225 - 2⁵ = 135421193 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a self number, because there is not a number n which added to its sum of digits gives 135421225.

It is not an unprimeable number, because it can be changed into a prime (135421229) 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 11 ways as a sum of consecutive naturals, for example, 44431 + ... + 47380.

It is an arithmetic number, because the mean of its divisors is an integer number (14230860).

Almost surely, 2^135421225 is an apocalyptic number.

It is an amenable number.

135421225 is a deficient number, since it is larger than the sum of its proper divisors (35349095).

135421225 is an equidigital number, since it uses as much as digits as its factorization.

135421225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91880 (or 91875 counting only the distinct ones).

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

The square root of 135421225 is about 11637.0625589106. The cubic root of 135421225 is about 513.5257742057.

Adding to 135421225 its reverse (522124531), we get a palindrome (657545756).

The spelling of 135421225 in words is "one hundred thirty-five million, four hundred twenty-one thousand, two hundred twenty-five".