221304413 has 8 divisors (see below), whose sum is σ = 251919936. Its totient is φ = 192438400.

The previous prime is 221304403. The next prime is 221304439. The reversal of 221304413 is 314403122.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 221304413 - 2¹⁶ = 221238877 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221304403) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 437108 + ... + 437613.

It is an arithmetic number, because the mean of its divisors is an integer number (31489992).

Almost surely, 2^221304413 is an apocalyptic number.

221304413 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

221304413 is a deficient number, since it is larger than the sum of its proper divisors (30615523).

221304413 is a wasteful number, since it uses less digits than its factorization.

221304413 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 874755.

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 221304413 is about 14876.3037411852. The cubic root of 221304413 is about 604.8718285959.

Adding to 221304413 its reverse (314403122), we get a palindrome (535707535).

The spelling of 221304413 in words is "two hundred twenty-one million, three hundred four thousand, four hundred thirteen".