221144311 has 2 divisors, whose sum is σ = 221144312. Its totient is φ = 221144310.

The previous prime is 221144299. The next prime is 221144321. The reversal of 221144311 is 113441122.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221144311 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221144321) 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, 110572155 + 110572156.

It is an arithmetic number, because the mean of its divisors is an integer number (110572156).

Almost surely, 2^221144311 is an apocalyptic number.

221144311 is a deficient number, since it is larger than the sum of its proper divisors (1).

221144311 is an equidigital number, since it uses as much as digits as its factorization.

221144311 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 192, while the sum is 19.

The square root of 221144311 is about 14870.9216593996. The cubic root of 221144311 is about 604.7259291826.

Adding to 221144311 its reverse (113441122), we get a palindrome (334585433).

The spelling of 221144311 in words is "two hundred twenty-one million, one hundred forty-four thousand, three hundred eleven".