221201323 has 4 divisors (see below), whose sum is σ = 252801520. Its totient is φ = 189601128.

The previous prime is 221201261. The next prime is 221201329. The reversal of 221201323 is 323102122.

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 221201323 - 2²⁵ = 187646891 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221201297 and 221201306.

It is not an unprimeable number, because it can be changed into a prime (221201329) 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, 15800088 + ... + 15800101.

It is an arithmetic number, because the mean of its divisors is an integer number (63200380).

Almost surely, 2^221201323 is an apocalyptic number.

221201323 is a deficient number, since it is larger than the sum of its proper divisors (31600197).

221201323 is an equidigital number, since it uses as much as digits as its factorization.

221201323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31600196.

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 221201323 is about 14872.8384311805. The cubic root of 221201323 is about 604.7778917408. Note that the first 3 decimals are identical.

Adding to 221201323 its reverse (323102122), we get a palindrome (544303445).

The spelling of 221201323 in words is "two hundred twenty-one million, two hundred one thousand, three hundred twenty-three".