21355466424171 has 96 divisors (see below), whose sum is σ = 31999810214400. Its totient is φ = 12655051200000.

The previous prime is 21355466424157. The next prime is 21355466424179. The reversal of 21355466424171 is 17142466455312.

It is a happy number.

It is not a de Polignac number, because 21355466424171 - 2⁵ = 21355466424139 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21355466424179) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 9487100796 + ... + 9487103046.

It is an arithmetic number, because the mean of its divisors is an integer number (333331356400).

Almost surely, 2^{21355466424171} is an apocalyptic number.

21355466424171 is a deficient number, since it is larger than the sum of its proper divisors (10644343790229).

21355466424171 is a wasteful number, since it uses less digits than its factorization.

21355466424171 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4689 (or 4678 counting only the distinct ones).

The product of its digits is 4838400, while the sum is 51.

The spelling of 21355466424171 in words is "twenty-one trillion, three hundred fifty-five billion, four hundred sixty-six million, four hundred twenty-four thousand, one hundred seventy-one".