135352772221 has 4 divisors (see below), whose sum is σ = 139010955292. Its totient is φ = 131694589152.

The previous prime is 135352772179. The next prime is 135352772231. The reversal of 135352772221 is 122277253531.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 103378325625 + 31974446596 = 321525^2 + 178814^2 .

It is a cyclic number.

It is not a de Polignac number, because 135352772221 - 2²³ = 135344383613 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135352772231) 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 3 ways as a sum of consecutive naturals, for example, 1829091480 + ... + 1829091553.

It is an arithmetic number, because the mean of its divisors is an integer number (34752738823).

Almost surely, 2^135352772221 is an apocalyptic number.

It is an amenable number.

135352772221 is a deficient number, since it is larger than the sum of its proper divisors (3658183071).

135352772221 is an equidigital number, since it uses as much as digits as its factorization.

135352772221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3658183070.

The product of its digits is 176400, while the sum is 40.

The spelling of 135352772221 in words is "one hundred thirty-five billion, three hundred fifty-two million, seven hundred seventy-two thousand, two hundred twenty-one".