12171074786820 has 96 divisors (see below), whose sum is σ = 37882757888640. Its totient is φ = 3244146353280.

The previous prime is 12171074786777. The next prime is 12171074786839. The reversal of 12171074786820 is 2868747017121.

It is a happy number.

12171074786820 is a `hidden beast` number, since 1 + 2 + 1 + 7 + 107 + 478 + 68 + 2 + 0 = 666.

It is a super-2 number, since 2×12171074786820² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3925911 + ... + 6305150.

It is an arithmetic number, because the mean of its divisors is an integer number (394612061340).

Almost surely, 2^{12171074786820} is an apocalyptic number.

12171074786820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12171074786820 is an abundant number, since it is smaller than the sum of its proper divisors (25711683101820).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12171074786820 is a wasteful number, since it uses less digits than its factorization.

12171074786820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10233282 (or 10233274 counting only the distinct ones).

The product of its (nonzero) digits is 2107392, while the sum is 54.

The spelling of 12171074786820 in words is "twelve trillion, one hundred seventy-one billion, seventy-four million, seven hundred eighty-six thousand, eight hundred twenty".