221001404 has 12 divisors (see below), whose sum is σ = 416502744. Its totient is φ = 102000624.

The previous prime is 221001397. The next prime is 221001409. The reversal of 221001404 is 404100122.

221001404 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221001409) 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, 2124962 + ... + 2125065.

It is an arithmetic number, because the mean of its divisors is an integer number (34708562).

Almost surely, 2^221001404 is an apocalyptic number.

It is an amenable number.

221001404 is a deficient number, since it is larger than the sum of its proper divisors (195501340).

221001404 is a wasteful number, since it uses less digits than its factorization.

221001404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4250044 (or 4250042 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 14.

The square root of 221001404 is about 14866.1159688736. The cubic root of 221001404 is about 604.5956399160.

Adding to 221001404 its reverse (404100122), we get a palindrome (625101526).

The spelling of 221001404 in words is "two hundred twenty-one million, one thousand, four hundred four".