135766845021 has 4 divisors (see below), whose sum is σ = 181022460032. Its totient is φ = 90511230012.

The previous prime is 135766845013. The next prime is 135766845047. The reversal of 135766845021 is 120548667531.

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, and also an emirpimes, since its reverse is a distinct semiprime: 120548667531 = 3 ⋅40182889177.

It is not a de Polignac number, because 135766845021 - 2³ = 135766845013 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 (135766849021) 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, 22627807501 + ... + 22627807506.

It is an arithmetic number, because the mean of its divisors is an integer number (45255615008).

Almost surely, 2^135766845021 is an apocalyptic number.

It is an amenable number.

135766845021 is a deficient number, since it is larger than the sum of its proper divisors (45255615011).

135766845021 is an equidigital number, since it uses as much as digits as its factorization.

135766845021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45255615010.

The product of its (nonzero) digits is 1209600, while the sum is 48.

The spelling of 135766845021 in words is "one hundred thirty-five billion, seven hundred sixty-six million, eight hundred forty-five thousand, twenty-one".