221006572 has 6 divisors (see below), whose sum is σ = 386761508. Its totient is φ = 110503284.

The previous prime is 221006557. The next prime is 221006573. The reversal of 221006572 is 275600122.

221006572 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is a super-3 number, since 3×221006572³ (a number of 26 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (221006573) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27625818 + ... + 27625825.

Almost surely, 2^221006572 is an apocalyptic number.

It is an amenable number.

221006572 is a deficient number, since it is larger than the sum of its proper divisors (165754936).

221006572 is a wasteful number, since it uses less digits than its factorization.

221006572 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55251647 (or 55251645 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 25.

The square root of 221006572 is about 14866.2897859553. The cubic root of 221006572 is about 604.6003525948.

Adding to 221006572 its reverse (275600122), we get a palindrome (496606694).

The spelling of 221006572 in words is "two hundred twenty-one million, six thousand, five hundred seventy-two".