221440273 has 4 divisors (see below), whose sum is σ = 221677540. Its totient is φ = 221203008.

The previous prime is 221440229. The next prime is 221440291. The reversal of 221440273 is 372044122.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 101143249 + 120297024 = 10057^2 + 10968^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221440273 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221440073) 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 in 3 ways as a sum of consecutive naturals, for example, 117228 + ... + 119101.

It is an arithmetic number, because the mean of its divisors is an integer number (55419385).

Almost surely, 2^221440273 is an apocalyptic number.

It is an amenable number.

221440273 is a deficient number, since it is larger than the sum of its proper divisors (237267).

221440273 is an equidigital number, since it uses as much as digits as its factorization.

221440273 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 237266.

The product of its (nonzero) digits is 2688, while the sum is 25.

The square root of 221440273 is about 14880.8693630446. The cubic root of 221440273 is about 604.9955813260.

Adding to 221440273 its reverse (372044122), we get a palindrome (593484395).

The spelling of 221440273 in words is "two hundred twenty-one million, four hundred forty thousand, two hundred seventy-three".