135505225021 has 16 divisors (see below), whose sum is σ = 140814745600. Its totient is φ = 130256573040.

The previous prime is 135505225019. The next prime is 135505225039. The reversal of 135505225021 is 120522505531.

It is a cyclic number.

It is not a de Polignac number, because 135505225021 - 2¹ = 135505225019 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135505225001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3726490 + ... + 3762676.

It is an arithmetic number, because the mean of its divisors is an integer number (8800921600).

Almost surely, 2^135505225021 is an apocalyptic number.

It is an amenable number.

135505225021 is a deficient number, since it is larger than the sum of its proper divisors (5309520579).

135505225021 is a wasteful number, since it uses less digits than its factorization.

135505225021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37024.

The product of its (nonzero) digits is 15000, while the sum is 31.

The spelling of 135505225021 in words is "one hundred thirty-five billion, five hundred five million, two hundred twenty-five thousand, twenty-one".