135221012 has 6 divisors (see below), whose sum is σ = 236636778. Its totient is φ = 67610504.

The previous prime is 135220973. The next prime is 135221033. The reversal of 135221012 is 210122531.

It is a happy number.

135221012 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 91317136 + 43903876 = 9556^2 + 6626^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16902623 + ... + 16902630.

It is an arithmetic number, because the mean of its divisors is an integer number (39439463).

Almost surely, 2^135221012 is an apocalyptic number.

It is an amenable number.

135221012 is a deficient number, since it is larger than the sum of its proper divisors (101415766).

135221012 is a wasteful number, since it uses less digits than its factorization.

135221012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33805257 (or 33805255 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 17.

The square root of 135221012 is about 11628.4569913639. The cubic root of 135221012 is about 513.2725759691.

Adding to 135221012 its reverse (210122531), we get a palindrome (345343543).

The spelling of 135221012 in words is "one hundred thirty-five million, two hundred twenty-one thousand, twelve".