223681321 has 16 divisors (see below), whose sum is σ = 235952640. Its totient is φ = 211760640.

The previous prime is 223681277. The next prime is 223681343. The reversal of 223681321 is 123186322.

223681321 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 223681321 - 2²¹ = 221584169 is a prime.

It is a Duffinian number.

Its product of digits (3456) is a multiple of the sum of its prime divisors (864).

It is a self number, because there is not a number n which added to its sum of digits gives 223681321.

It is not an unprimeable number, because it can be changed into a prime (223681421) 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, 368200 + ... + 368806.

It is an arithmetic number, because the mean of its divisors is an integer number (14747040).

Almost surely, 2^223681321 is an apocalyptic number.

It is an amenable number.

223681321 is a deficient number, since it is larger than the sum of its proper divisors (12271319).

223681321 is a wasteful number, since it uses less digits than its factorization.

223681321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 864.

The product of its digits is 3456, while the sum is 28.

The square root of 223681321 is about 14955.9794396756. The cubic root of 223681321 is about 607.0296525877.

The spelling of 223681321 in words is "two hundred twenty-three million, six hundred eighty-one thousand, three hundred twenty-one".