221044451 has 2 divisors, whose sum is σ = 221044452. Its totient is φ = 221044450.

The previous prime is 221044391. The next prime is 221044471. The reversal of 221044451 is 154440122.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221044451 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (221044471) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110522225 + 110522226.

It is an arithmetic number, because the mean of its divisors is an integer number (110522226).

Almost surely, 2^221044451 is an apocalyptic number.

221044451 is a deficient number, since it is larger than the sum of its proper divisors (1).

221044451 is an equidigital number, since it uses as much as digits as its factorization.

221044451 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1280, while the sum is 23.

The square root of 221044451 is about 14867.5637210674. The cubic root of 221044451 is about 604.6348920632.

Adding to 221044451 its reverse (154440122), we get a palindrome (375484573).

It can be divided in two parts, 22 and 1044451, that multiplied together give a palindrome (22977922).

The spelling of 221044451 in words is "two hundred twenty-one million, forty-four thousand, four hundred fifty-one".