221400304 has 20 divisors (see below), whose sum is σ = 440557864. Its totient is φ = 107707968.

The previous prime is 221400253. The next prime is 221400307. The reversal of 221400304 is 403004122.

221400304 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×221400304² = 98036189222584832, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221400307) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 186402 + ... + 187585.

Almost surely, 2^221400304 is an apocalyptic number.

It is an amenable number.

221400304 is a deficient number, since it is larger than the sum of its proper divisors (219157560).

221400304 is a wasteful number, since it uses less digits than its factorization.

221400304 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 374032 (or 374026 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 16.

The square root of 221400304 is about 14879.5263365471. The cubic root of 221400304 is about 604.9591794510.

Adding to 221400304 its reverse (403004122), we get a palindrome (624404426).

The spelling of 221400304 in words is "two hundred twenty-one million, four hundred thousand, three hundred four".