221102404 has 12 divisors (see below), whose sum is σ = 403752384. Its totient is φ = 105744584.

The previous prime is 221102389. The next prime is 221102407. The reversal of 221102404 is 404201122.

It is not an unprimeable number, because it can be changed into a prime (221102407) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1201552 + ... + 1201735.

It is an arithmetic number, because the mean of its divisors is an integer number (33646032).

Almost surely, 2^221102404 is an apocalyptic number.

It is an amenable number.

221102404 is a deficient number, since it is larger than the sum of its proper divisors (182649980).

221102404 is a wasteful number, since it uses less digits than its factorization.

221102404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2403314 (or 2403312 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 16.

The square root of 221102404 is about 14869.5125676668. The cubic root of 221102404 is about 604.6877281088.

Adding to 221102404 its reverse (404201122), we get a palindrome (625303526).

The spelling of 221102404 in words is "two hundred twenty-one million, one hundred two thousand, four hundred four".