221206604 has 6 divisors (see below), whose sum is σ = 387111564. Its totient is φ = 110603300.

The previous prime is 221206591. The next prime is 221206619. The reversal of 221206604 is 406602122.

221206604 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 221206604.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27650822 + ... + 27650829.

It is an arithmetic number, because the mean of its divisors is an integer number (64518594).

Almost surely, 2^221206604 is an apocalyptic number.

It is an amenable number.

221206604 is a deficient number, since it is larger than the sum of its proper divisors (165904960).

221206604 is a wasteful number, since it uses less digits than its factorization.

221206604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55301655 (or 55301653 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 23.

The square root of 221206604 is about 14873.0159685250. The cubic root of 221206604 is about 604.7827045610.

Adding to 221206604 its reverse (406602122), we get a palindrome (627808726).

The spelling of 221206604 in words is "two hundred twenty-one million, two hundred six thousand, six hundred four".