21436140207171 has 8 divisors (see below), whose sum is σ = 29120794243920. Its totient is φ = 14021123154272.

The previous prime is 21436140207161. The next prime is 21436140207191. The reversal of 21436140207171 is 17170204163412.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21436140207171 - 2¹⁹ = 21436139682883 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21436140207161) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 67409245776 + ... + 67409246093.

It is an arithmetic number, because the mean of its divisors is an integer number (3640099280490).

Almost surely, 2^{21436140207171} is an apocalyptic number.

21436140207171 is a deficient number, since it is larger than the sum of its proper divisors (7684654036749).

21436140207171 is a wasteful number, since it uses less digits than its factorization.

21436140207171 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134818491925.

The product of its (nonzero) digits is 56448, while the sum is 39.

The spelling of 21436140207171 in words is "twenty-one trillion, four hundred thirty-six billion, one hundred forty million, two hundred seven thousand, one hundred seventy-one".