221040404 has 12 divisors (see below), whose sum is σ = 416576244. Its totient is φ = 102018624.

The previous prime is 221040403. The next prime is 221040427. The reversal of 221040404 is 404040122.

221040404 is digitally balanced in base 2 and base 3, because in such bases 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 77088400 + 143952004 = 8780^2 + 11998^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221040401) 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, 2125337 + ... + 2125440.

It is an arithmetic number, because the mean of its divisors is an integer number (34714687).

Almost surely, 2^221040404 is an apocalyptic number.

It is an amenable number.

221040404 is a deficient number, since it is larger than the sum of its proper divisors (195535840).

221040404 is a wasteful number, since it uses less digits than its factorization.

221040404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4250794 (or 4250792 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 17.

The square root of 221040404 is about 14867.4276187914. The cubic root of 221040404 is about 604.6312020477.

Adding to 221040404 its reverse (404040122), we get a palindrome (625080526).

The spelling of 221040404 in words is "two hundred twenty-one million, forty thousand, four hundred four".