12171668281 has 4 divisors (see below), whose sum is σ = 12178834000. Its totient is φ = 12164502564.

The previous prime is 12171668251. The next prime is 12171668303. The reversal of 12171668281 is 18286617121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12171668281 is a prime.

It is a super-2 number, since 2×12171668281² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12171668251) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3580311 + ... + 3583708.

It is an arithmetic number, because the mean of its divisors is an integer number (3044708500).

Almost surely, 2^12171668281 is an apocalyptic number.

It is an amenable number.

12171668281 is a deficient number, since it is larger than the sum of its proper divisors (7165719).

12171668281 is an equidigital number, since it uses as much as digits as its factorization.

12171668281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7165718.

The product of its digits is 64512, while the sum is 43.

The spelling of 12171668281 in words is "twelve billion, one hundred seventy-one million, six hundred sixty-eight thousand, two hundred eighty-one".