221442433 has 2 divisors, whose sum is σ = 221442434. Its totient is φ = 221442432.

The previous prime is 221442421. The next prime is 221442443. The reversal of 221442433 is 334244122.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 172344384 + 49098049 = 13128^2 + 7007^2 .

It is a cyclic number.

It is not a de Polignac number, because 221442433 - 2¹⁷ = 221311361 is a prime.

It is a super-2 number, since 2×221442433² = 98073502265918978, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 221442398 and 221442407.

It is not a weakly prime, because it can be changed into another prime (221442443) 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, 110721216 + 110721217.

It is an arithmetic number, because the mean of its divisors is an integer number (110721217).

Almost surely, 2^221442433 is an apocalyptic number.

It is an amenable number.

221442433 is a deficient number, since it is larger than the sum of its proper divisors (1).

221442433 is an equidigital number, since it uses as much as digits as its factorization.

221442433 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4608, while the sum is 25.

The square root of 221442433 is about 14880.9419392725. The cubic root of 221442433 is about 604.9975484271.

Adding to 221442433 its reverse (334244122), we get a palindrome (555686555).

The spelling of 221442433 in words is "two hundred twenty-one million, four hundred forty-two thousand, four hundred thirty-three".