135221534 has 16 divisors (see below), whose sum is σ = 232037088. Its totient is φ = 57894912.

The previous prime is 135221533. The next prime is 135221539. The reversal of 135221534 is 435122531.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135221533) 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, 11954 + ... + 20330.

It is an arithmetic number, because the mean of its divisors is an integer number (14502318).

Almost surely, 2^135221534 is an apocalyptic number.

135221534 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

135221534 is a deficient number, since it is larger than the sum of its proper divisors (96815554).

135221534 is a wasteful number, since it uses less digits than its factorization.

135221534 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9539.

The product of its digits is 3600, while the sum is 26.

The square root of 135221534 is about 11628.4794362806. The cubic root of 135221534 is about 513.2732364383.

The spelling of 135221534 in words is "one hundred thirty-five million, two hundred twenty-one thousand, five hundred thirty-four".