221632064 has 14 divisors (see below), whose sum is σ = 439801254. Its totient is φ = 110816000.

The previous prime is 221632063. The next prime is 221632067. The reversal of 221632064 is 460236122.

It can be written as a sum of positive squares in only one way, i.e., 144192064 + 77440000 = 12008^2 + 8800^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221632063) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1731437 + ... + 1731564.

Almost surely, 2^221632064 is an apocalyptic number.

It is an amenable number.

221632064 is a deficient number, since it is larger than the sum of its proper divisors (218169190).

221632064 is an equidigital number, since it uses as much as digits as its factorization.

221632064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3463013 (or 3463003 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 26.

The square root of 221632064 is about 14887.3121818547. The cubic root of 221632064 is about 605.1701945873.

Adding to 221632064 its reverse (460236122), we get a palindrome (681868186).

The spelling of 221632064 in words is "two hundred twenty-one million, six hundred thirty-two thousand, sixty-four".