21786130844727 has 16 divisors (see below), whose sum is σ = 29122376934912. Its totient is φ = 14486988589920.

The previous prime is 21786130844717. The next prime is 21786130844729. The reversal of 21786130844727 is 72744803168712.

It is a happy number.

It is not a de Polignac number, because 21786130844727 - 2¹⁶ = 21786130779191 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21786130844729) 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 15 ways as a sum of consecutive naturals, for example, 34856902 + ... + 35476412.

It is an arithmetic number, because the mean of its divisors is an integer number (1820148558432).

Almost surely, 2^{21786130844727} is an apocalyptic number.

21786130844727 is a deficient number, since it is larger than the sum of its proper divisors (7336246090185).

21786130844727 is a wasteful number, since it uses less digits than its factorization.

21786130844727 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 649438.

The product of its (nonzero) digits is 25288704, while the sum is 60.

The spelling of 21786130844727 in words is "twenty-one trillion, seven hundred eighty-six billion, one hundred thirty million, eight hundred forty-four thousand, seven hundred twenty-seven".