221385823 has 8 divisors (see below), whose sum is σ = 225783936. Its totient is φ = 216996000.

The previous prime is 221385821. The next prime is 221385847. The reversal of 221385823 is 328583122.

221385823 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 221385823 - 2¹ = 221385821 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 (221385821) 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, 102333 + ... + 104473.

It is an arithmetic number, because the mean of its divisors is an integer number (28222992).

Almost surely, 2^221385823 is an apocalyptic number.

221385823 is a deficient number, since it is larger than the sum of its proper divisors (4398113).

221385823 is a wasteful number, since it uses less digits than its factorization.

221385823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4145.

The product of its digits is 23040, while the sum is 34.

The square root of 221385823 is about 14879.0397203583. The cubic root of 221385823 is about 604.9459897599.

The spelling of 221385823 in words is "two hundred twenty-one million, three hundred eighty-five thousand, eight hundred twenty-three".