135511115021 has 4 divisors (see below), whose sum is σ = 139882441344. Its totient is φ = 131139788700.

The previous prime is 135511115017. The next prime is 135511115057. The reversal of 135511115021 is 120511115531.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 135511115021 - 2² = 135511115017 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 (135511115321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2185663115 + ... + 2185663176.

It is an arithmetic number, because the mean of its divisors is an integer number (34970610336).

Almost surely, 2^135511115021 is an apocalyptic number.

It is an amenable number.

135511115021 is a deficient number, since it is larger than the sum of its proper divisors (4371326323).

135511115021 is an equidigital number, since it uses as much as digits as its factorization.

135511115021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4371326322.

The product of its (nonzero) digits is 750, while the sum is 26.

The spelling of 135511115021 in words is "one hundred thirty-five billion, five hundred eleven million, one hundred fifteen thousand, twenty-one".