163863021 has 16 divisors (see below), whose sum is σ = 258307200. Its totient is φ = 90406848.

The previous prime is 163863013. The next prime is 163863031. The reversal of 163863021 is 120368361.

It is not a de Polignac number, because 163863021 - 2³ = 163863013 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 163863021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (163863031) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 133926 + ... + 135143.

It is an arithmetic number, because the mean of its divisors is an integer number (16144200).

Almost surely, 2^163863021 is an apocalyptic number.

It is an amenable number.

163863021 is a deficient number, since it is larger than the sum of its proper divisors (94444179).

163863021 is a wasteful number, since it uses less digits than its factorization.

163863021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 269108.

The product of its (nonzero) digits is 5184, while the sum is 30.

The square root of 163863021 is about 12800.8992262263. The cubic root of 163863021 is about 547.2179302234.

The spelling of 163863021 in words is "one hundred sixty-three million, eight hundred sixty-three thousand, twenty-one".