135721012 has 24 divisors (see below), whose sum is σ = 271800704. Its totient is φ = 58089312.

The previous prime is 135720997. The next prime is 135721031. The reversal of 135721012 is 210127531.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 21793 + ... + 27319.

Almost surely, 2^135721012 is an apocalyptic number.

It is an amenable number.

135721012 is an abundant number, since it is smaller than the sum of its proper divisors (136079692).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

135721012 is a wasteful number, since it uses less digits than its factorization.

135721012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6415 (or 6413 counting only the distinct ones).

The product of its (nonzero) digits is 420, while the sum is 22.

The square root of 135721012 is about 11649.9361371640. The cubic root of 135721012 is about 513.9044319588.

Adding to 135721012 its reverse (210127531), we get a palindrome (345848543).

The spelling of 135721012 in words is "one hundred thirty-five million, seven hundred twenty-one thousand, twelve".