12171470436891 has 12 divisors (see below), whose sum is σ = 17581240797120. Its totient is φ = 8114208419760.

The previous prime is 12171470436833. The next prime is 12171470436911. The reversal of 12171470436891 is 19863407417121.

12171470436891 is a `hidden beast` number, since 1 + 2 + 1 + 71 + 470 + 43 + 68 + 9 + 1 = 666.

It is not a de Polignac number, because 12171470436891 - 2⁹ = 12171470436379 is a prime.

It is a super-2 number, since 2×12171470436891² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (12171470436991) 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 11 ways as a sum of consecutive naturals, for example, 8031096 + ... + 9425573.

It is an arithmetic number, because the mean of its divisors is an integer number (1465103399760).

Almost surely, 2^{12171470436891} is an apocalyptic number.

12171470436891 is a deficient number, since it is larger than the sum of its proper divisors (5409770360229).

12171470436891 is a wasteful number, since it uses less digits than its factorization.

12171470436891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17534146 (or 17534143 counting only the distinct ones).

The product of its (nonzero) digits is 2032128, while the sum is 54.

The spelling of 12171470436891 in words is "twelve trillion, one hundred seventy-one billion, four hundred seventy million, four hundred thirty-six thousand, eight hundred ninety-one".