12171432420 has 108 divisors (see below), whose sum is σ = 42947799804. Its totient is φ = 2782039680.

The previous prime is 12171432401. The next prime is 12171432439. The reversal of 12171432420 is 2423417121.

12171432420 is a `hidden beast` number, since 121 + 71 + 432 + 42 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (12171432401) and next prime (12171432439).

It can be written as a sum of positive squares in 2 ways, for example, as 2578405284 + 9593027136 = 50778^2 + 97944^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 681171 + ... + 698810.

It is an arithmetic number, because the mean of its divisors is an integer number (397664813).

Almost surely, 2^12171432420 is an apocalyptic number.

12171432420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12171432420 is an abundant number, since it is smaller than the sum of its proper divisors (30776367384).

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

12171432420 is a wasteful number, since it uses less digits than its factorization.

12171432420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1380010 (or 1379998 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 27.

Adding to 12171432420 its reverse (2423417121), we get a palindrome (14594849541).

The spelling of 12171432420 in words is "twelve billion, one hundred seventy-one million, four hundred thirty-two thousand, four hundred twenty".