221344427 has 2 divisors, whose sum is σ = 221344428. Its totient is φ = 221344426.

The previous prime is 221344393. The next prime is 221344451. The reversal of 221344427 is 724443122.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 221344427 - 2⁸ = 221344171 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 221344427.

It is not a weakly prime, because it can be changed into another prime (221344477) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110672213 + 110672214.

It is an arithmetic number, because the mean of its divisors is an integer number (110672214).

Almost surely, 2^221344427 is an apocalyptic number.

221344427 is a deficient number, since it is larger than the sum of its proper divisors (1).

221344427 is an equidigital number, since it uses as much as digits as its factorization.

221344427 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10752, while the sum is 29.

The square root of 221344427 is about 14877.6485709268. The cubic root of 221344427 is about 604.9082819777.

Adding to 221344427 its reverse (724443122), we get a palindrome (945787549).

The spelling of 221344427 in words is "two hundred twenty-one million, three hundred forty-four thousand, four hundred twenty-seven".