221233604 has 6 divisors (see below), whose sum is σ = 387158814. Its totient is φ = 110616800.

The previous prime is 221233591. The next prime is 221233609. The reversal of 221233604 is 406332122.

221233604 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 only one way, i.e., 183656704 + 37576900 = 13552^2 + 6130^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 221233604.

It is not an unprimeable number, because it can be changed into a prime (221233609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27654197 + ... + 27654204.

It is an arithmetic number, because the mean of its divisors is an integer number (64526469).

Almost surely, 2^221233604 is an apocalyptic number.

It is an amenable number.

221233604 is a deficient number, since it is larger than the sum of its proper divisors (165925210).

221233604 is a wasteful number, since it uses less digits than its factorization.

221233604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55308405 (or 55308403 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 23.

The square root of 221233604 is about 14873.9236249216. The cubic root of 221233604 is about 604.8073097166.

Adding to 221233604 its reverse (406332122), we get a palindrome (627565726).

The spelling of 221233604 in words is "two hundred twenty-one million, two hundred thirty-three thousand, six hundred four".