221443373 has 2 divisors, whose sum is σ = 221443374. Its totient is φ = 221443372.

The previous prime is 221443363. The next prime is 221443403. The reversal of 221443373 is 373344122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 147792649 + 73650724 = 12157^2 + 8582^2 .

It is a cyclic number.

It is not a de Polignac number, because 221443373 - 2¹⁰ = 221442349 is a prime.

It is a super-3 number, since 3×221443373³ (a number of 26 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221443363) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110721686 + 110721687.

It is an arithmetic number, because the mean of its divisors is an integer number (110721687).

Almost surely, 2^221443373 is an apocalyptic number.

It is an amenable number.

221443373 is a deficient number, since it is larger than the sum of its proper divisors (1).

221443373 is an equidigital number, since it uses as much as digits as its factorization.

221443373 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12096, while the sum is 29.

The square root of 221443373 is about 14880.9735232612. The cubic root of 221443373 is about 604.9984044764.

Adding to 221443373 its reverse (373344122), we get a palindrome (594787495).

The spelling of 221443373 in words is "two hundred twenty-one million, four hundred forty-three thousand, three hundred seventy-three".