221447418724 has 27 divisors (see below), whose sum is σ = 450817085817. Its totient is φ = 94903213104.

The previous prime is 221447418721. The next prime is 221447418761. The reversal of 221447418724 is 427814744122.

The square root of 221447418724 is 470582.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 52171128100 + 169276290624 = 228410^2 + 411432^2 .

It is not an unprimeable number, because it can be changed into a prime (221447418721) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 6571342 + ... + 6604954.

Almost surely, 2^221447418724 is an apocalyptic number.

221447418724 is the 470582-nd square number.

It is an amenable number.

221447418724 is an abundant number, since it is smaller than the sum of its proper divisors (229369667093).

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

221447418724 is an frugal number, since it uses more digits than its factorization.

221447418724 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67244 (or 33622 counting only the distinct ones).

The product of its digits is 802816, while the sum is 46.

The spelling of 221447418724 in words is "two hundred twenty-one billion, four hundred forty-seven million, four hundred eighteen thousand, seven hundred twenty-four".