12171335940 has 192 divisors, whose sum is σ = 39272325120. Its totient is φ = 3126176640.

The previous prime is 12171335933. The next prime is 12171335987. The reversal of 12171335940 is 4953317121.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 12171335895 and 12171335904.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 3798379 + ... + 3801581.

It is an arithmetic number, because the mean of its divisors is an integer number (204543360).

Almost surely, 2^12171335940 is an apocalyptic number.

12171335940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12171335940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19636162560).

12171335940 is an abundant number, since it is smaller than the sum of its proper divisors (27100989180).

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

12171335940 is a wasteful number, since it uses less digits than its factorization.

12171335940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3479 (or 3471 counting only the distinct ones).

The product of its (nonzero) digits is 22680, while the sum is 36.

The spelling of 12171335940 in words is "twelve billion, one hundred seventy-one million, three hundred thirty-five thousand, nine hundred forty".