221143404 has 48 divisors (see below), whose sum is σ = 523047168. Its totient is φ = 72715968.

The previous prime is 221143399. The next prime is 221143409. The reversal of 221143404 is 404341122.

221143404 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (221143399) and next prime (221143409).

It is not an unprimeable number, because it can be changed into a prime (221143409) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 326314 + ... + 326990.

It is an arithmetic number, because the mean of its divisors is an integer number (10896816).

Almost surely, 2^221143404 is an apocalyptic number.

It is an amenable number.

221143404 is an abundant number, since it is smaller than the sum of its proper divisors (301903764).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221143404 is a wasteful number, since it uses less digits than its factorization.

221143404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1014 (or 1012 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 21.

The square root of 221143404 is about 14870.8911636122. The cubic root of 221143404 is about 604.7251024417.

Adding to 221143404 its reverse (404341122), we get a palindrome (625484526).

The spelling of 221143404 in words is "two hundred twenty-one million, one hundred forty-three thousand, four hundred four".