163116021 has 4 divisors (see below), whose sum is σ = 217488032. Its totient is φ = 108744012.

The previous prime is 163116011. The next prime is 163116047. The reversal of 163116021 is 120611361.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 163116021 - 2⁶ = 163115957 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (163116001) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27186001 + ... + 27186006.

It is an arithmetic number, because the mean of its divisors is an integer number (54372008).

Almost surely, 2^163116021 is an apocalyptic number.

It is an amenable number.

163116021 is a deficient number, since it is larger than the sum of its proper divisors (54372011).

163116021 is an equidigital number, since it uses as much as digits as its factorization.

163116021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54372010.

The product of its (nonzero) digits is 216, while the sum is 21.

The square root of 163116021 is about 12771.6882595842. The cubic root of 163116021 is about 546.3851319440.

Adding to 163116021 its reverse (120611361), we get a palindrome (283727382).

The spelling of 163116021 in words is "one hundred sixty-three million, one hundred sixteen thousand, twenty-one".