222144521 has 2 divisors, whose sum is σ = 222144522. Its totient is φ = 222144520.

The previous prime is 222144479. The next prime is 222144539. The reversal of 222144521 is 125441222.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 186622921 + 35521600 = 13661^2 + 5960^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-222144521 is a prime.

It is not a weakly prime, because it can be changed into another prime (222144581) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 111072260 + 111072261.

It is an arithmetic number, because the mean of its divisors is an integer number (111072261).

Almost surely, 2^222144521 is an apocalyptic number.

It is an amenable number.

222144521 is a deficient number, since it is larger than the sum of its proper divisors (1).

222144521 is an equidigital number, since it uses as much as digits as its factorization.

222144521 is an odious number, because the sum of its binary digits is odd.

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

The square root of 222144521 is about 14904.5134439203. The cubic root of 222144521 is about 605.6362598022.

Adding to 222144521 its reverse (125441222), we get a palindrome (347585743).

The spelling of 222144521 in words is "two hundred twenty-two million, one hundred forty-four thousand, five hundred twenty-one".