135236021504 has 18 divisors (see below), whose sum is σ = 269943777810. Its totient is φ = 67618010624.

The previous prime is 135236021497. The next prime is 135236021507. The reversal of 135236021504 is 405120632531.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 135070950400 + 165071104 = 367520^2 + 12848^2 .

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135236021507) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 264132599 + ... + 264133110.

It is an arithmetic number, because the mean of its divisors is an integer number (14996876545).

Almost surely, 2^135236021504 is an apocalyptic number.

It is an amenable number.

135236021504 is a deficient number, since it is larger than the sum of its proper divisors (134707756306).

135236021504 is an frugal number, since it uses more digits than its factorization.

135236021504 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 528265725 (or 528265711 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 32.

The spelling of 135236021504 in words is "one hundred thirty-five billion, two hundred thirty-six million, twenty-one thousand, five hundred four".