163421172 has 24 divisors (see below), whose sum is σ = 423684800. Its totient is φ = 54473688.

The previous prime is 163421171. The next prime is 163421189. The reversal of 163421172 is 271124361.

163421172 is a `hidden beast` number, since 1 + 634 + 21 + 1 + 7 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (163421171) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 756472 + ... + 756687.

Almost surely, 2^163421172 is an apocalyptic number.

163421172 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

163421172 is an abundant number, since it is smaller than the sum of its proper divisors (260263628).

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

163421172 is a wasteful number, since it uses less digits than its factorization.

163421172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1513172 (or 1513164 counting only the distinct ones).

The product of its digits is 2016, while the sum is 27.

The square root of 163421172 is about 12783.6290622030. The cubic root of 163421172 is about 546.7256382611.

The spelling of 163421172 in words is "one hundred sixty-three million, four hundred twenty-one thousand, one hundred seventy-two".