221445456 has 40 divisors (see below), whose sum is σ = 602178720. Its totient is φ = 69929856.

The previous prime is 221445391. The next prime is 221445457. The reversal of 221445456 is 654544122.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221445457) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 120495 + ... + 122318.

It is an arithmetic number, because the mean of its divisors is an integer number (15054468).

Almost surely, 2^221445456 is an apocalyptic number.

It is an amenable number.

221445456 is an abundant number, since it is smaller than the sum of its proper divisors (380733264).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221445456 is a wasteful number, since it uses less digits than its factorization.

221445456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 242843 (or 242837 counting only the distinct ones).

The product of its digits is 38400, while the sum is 33.

The square root of 221445456 is about 14881.0435117971. The cubic root of 221445456 is about 605.0003014365. Note that the first 3 decimals are identical.

Adding to 221445456 its reverse (654544122), we get a palindrome (875989578).

The spelling of 221445456 in words is "two hundred twenty-one million, four hundred forty-five thousand, four hundred fifty-six".