135248686164021 has 4 divisors (see below), whose sum is σ = 180331581552032. Its totient is φ = 90165790776012.

The previous prime is 135248686164001. The next prime is 135248686164071. The reversal of 135248686164021 is 120461686842531.

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 not a de Polignac number, because 135248686164021 - 2⁶ = 135248686163957 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 (135248686164001) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22541447694001 + ... + 22541447694006.

It is an arithmetic number, because the mean of its divisors is an integer number (45082895388008).

Almost surely, 2^{135248686164021} is an apocalyptic number.

It is an amenable number.

135248686164021 is a deficient number, since it is larger than the sum of its proper divisors (45082895388011).

135248686164021 is an equidigital number, since it uses as much as digits as its factorization.

135248686164021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45082895388010.

The product of its (nonzero) digits is 13271040, while the sum is 57.

The spelling of 135248686164021 in words is "one hundred thirty-five trillion, two hundred forty-eight billion, six hundred eighty-six million, one hundred sixty-four thousand, twenty-one".