163412721 has 20 divisors (see below), whose sum is σ = 258471972. Its totient is φ = 102532608.

The previous prime is 163412681. The next prime is 163412741. The reversal of 163412721 is 127214361.

163412721 is a `hidden beast` number, since 1 + 634 + 1 + 2 + 7 + 21 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 145443600 + 17969121 = 12060^2 + 4239^2 .

It is not a de Polignac number, because 163412721 - 2⁶ = 163412657 is a prime.

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

It is an alternating number because its digits alternate between odd and even.

It is not an unprimeable number, because it can be changed into a prime (163412741) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 57960 + ... + 60713.

Almost surely, 2^163412721 is an apocalyptic number.

It is an amenable number.

163412721 is a deficient number, since it is larger than the sum of its proper divisors (95059251).

163412721 is a wasteful number, since it uses less digits than its factorization.

163412721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 118702 (or 118693 counting only the distinct ones).

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

The square root of 163412721 is about 12783.2985179882. The cubic root of 163412721 is about 546.7162138233.

The spelling of 163412721 in words is "one hundred sixty-three million, four hundred twelve thousand, seven hundred twenty-one".