221823449 has 2 divisors, whose sum is σ = 221823450. Its totient is φ = 221823448.

The previous prime is 221823443. The next prime is 221823451. The reversal of 221823449 is 944328122.

221823449 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 208369225 + 13454224 = 14435^2 + 3668^2 .

It is a cyclic number.

It is not a de Polignac number, because 221823449 - 2⁸ = 221823193 is a prime.

Together with 221823451, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (221823443) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110911724 + 110911725.

It is an arithmetic number, because the mean of its divisors is an integer number (110911725).

Almost surely, 2^221823449 is an apocalyptic number.

It is an amenable number.

221823449 is a deficient number, since it is larger than the sum of its proper divisors (1).

221823449 is an equidigital number, since it uses as much as digits as its factorization.

221823449 is an evil number, because the sum of its binary digits is even.

The product of its digits is 27648, while the sum is 35.

The square root of 221823449 is about 14893.7385837136. The cubic root of 221823449 is about 605.3443378251.

The spelling of 221823449 in words is "two hundred twenty-one million, eight hundred twenty-three thousand, four hundred forty-nine".