221011472 has 20 divisors (see below), whose sum is σ = 467138256. Its totient is φ = 100459680.

The previous prime is 221011459. The next prime is 221011481. The reversal of 221011472 is 274110122.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 627698 + ... + 628049.

Almost surely, 2^221011472 is an apocalyptic number.

221011472 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

221011472 is an abundant number, since it is smaller than the sum of its proper divisors (246126784).

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

221011472 is a wasteful number, since it uses less digits than its factorization.

221011472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1255766 (or 1255760 counting only the distinct ones).

The product of its (nonzero) digits is 224, while the sum is 20.

The square root of 221011472 is about 14866.4545874260. The cubic root of 221011472 is about 604.6048208177.

Adding to 221011472 its reverse (274110122), we get a palindrome (495121594).

The spelling of 221011472 in words is "two hundred twenty-one million, eleven thousand, four hundred seventy-two".