221639072 has 24 divisors (see below), whose sum is σ = 437012100. Its totient is φ = 110651904.

The previous prime is 221639069. The next prime is 221639107. The reversal of 221639072 is 270936122.

It is a happy number.

221639072 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 204032656 + 17606416 = 14284^2 + 4196^2 .

It is a Harshad number since it is a multiple of its sum of digits (32).

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, 17804 + ... + 27572.

Almost surely, 2^221639072 is an apocalyptic number.

It is an amenable number.

221639072 is a deficient number, since it is larger than the sum of its proper divisors (215373028).

221639072 is an equidigital number, since it uses as much as digits as its factorization.

221639072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10488 (or 10480 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 32.

The square root of 221639072 is about 14887.5475482028. The cubic root of 221639072 is about 605.1765730086.

The spelling of 221639072 in words is "two hundred twenty-one million, six hundred thirty-nine thousand, seventy-two".