221144369 has 2 divisors, whose sum is σ = 221144370. Its totient is φ = 221144368.

The previous prime is 221144321. The next prime is 221144389. The reversal of 221144369 is 963441122.

221144369 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., 220671025 + 473344 = 14855^2 + 688^2 .

It is a cyclic number.

It is not a de Polignac number, because 221144369 - 2¹² = 221140273 is a prime.

It is a super-2 number, since 2×221144369² = 97809663880816322, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (221144389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110572184 + 110572185.

It is an arithmetic number, because the mean of its divisors is an integer number (110572185).

Almost surely, 2^221144369 is an apocalyptic number.

It is an amenable number.

221144369 is a deficient number, since it is larger than the sum of its proper divisors (1).

221144369 is an equidigital number, since it uses as much as digits as its factorization.

221144369 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10368, while the sum is 32.

The square root of 221144369 is about 14870.9236095140. The cubic root of 221144369 is about 604.7259820502.

The spelling of 221144369 in words is "two hundred twenty-one million, one hundred forty-four thousand, three hundred sixty-nine".