221163923 has 4 divisors (see below), whose sum is σ = 221202600. Its totient is φ = 221125248.

The previous prime is 221163893. The next prime is 221163941. The reversal of 221163923 is 329361122.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 221163923 - 2¹⁰ = 221162899 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221163953) 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, 8873 + ... + 22826.

It is an arithmetic number, because the mean of its divisors is an integer number (55300650).

Almost surely, 2^221163923 is an apocalyptic number.

221163923 is a deficient number, since it is larger than the sum of its proper divisors (38677).

221163923 is an equidigital number, since it uses as much as digits as its factorization.

221163923 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38676.

The product of its digits is 3888, while the sum is 29.

The square root of 221163923 is about 14871.5810524638. The cubic root of 221163923 is about 604.7438051935.

The spelling of 221163923 in words is "two hundred twenty-one million, one hundred sixty-three thousand, nine hundred twenty-three".