21786135180135 has 64 divisors (see below), whose sum is σ = 35867108624256. Its totient is φ = 11285382758400.

The previous prime is 21786135180133. The next prime is 21786135180181. The reversal of 21786135180135 is 53108153168712.

It is not a de Polignac number, because 21786135180135 - 2¹ = 21786135180133 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21786135180133) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1592430495 + ... + 1592444175.

It is an arithmetic number, because the mean of its divisors is an integer number (560423572254).

Almost surely, 2^{21786135180135} is an apocalyptic number.

21786135180135 is a deficient number, since it is larger than the sum of its proper divisors (14080973444121).

21786135180135 is a wasteful number, since it uses less digits than its factorization.

21786135180135 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25076.

The product of its (nonzero) digits is 1209600, while the sum is 51.

The spelling of 21786135180135 in words is "twenty-one trillion, seven hundred eighty-six billion, one hundred thirty-five million, one hundred eighty thousand, one hundred thirty-five".