221639552 has 16 divisors (see below), whose sum is σ = 441547800. Its totient is φ = 110819712.

The previous prime is 221639549. The next prime is 221639567. The reversal of 221639552 is 255936122.

221639552 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (16).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 865652 + ... + 865907.

Almost surely, 2^221639552 is an apocalyptic number.

It is an amenable number.

221639552 is a deficient number, since it is larger than the sum of its proper divisors (219908248).

221639552 is an equidigital number, since it uses as much as digits as its factorization.

221639552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1731573 (or 1731561 counting only the distinct ones).

The product of its digits is 32400, while the sum is 35.

The square root of 221639552 is about 14887.5636690494. The cubic root of 221639552 is about 605.1770098818.

The spelling of 221639552 in words is "two hundred twenty-one million, six hundred thirty-nine thousand, five hundred fifty-two".