343216221 has 8 divisors (see below), whose sum is σ = 472383744. Its totient is φ = 221429760.

The previous prime is 343216193. The next prime is 343216241. The reversal of 343216221 is 122612343.

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

It is not a de Polignac number, because 343216221 - 2¹³ = 343208029 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 343216191 and 343216200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (343216241) 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 7 ways as a sum of consecutive naturals, for example, 1845156 + ... + 1845341.

It is an arithmetic number, because the mean of its divisors is an integer number (59047968).

Almost surely, 2^343216221 is an apocalyptic number.

343216221 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

It is an amenable number.

343216221 is a deficient number, since it is larger than the sum of its proper divisors (129167523).

343216221 is a wasteful number, since it uses less digits than its factorization.

343216221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3690531.

The product of its digits is 1728, while the sum is 24.

The square root of 343216221 is about 18526.0956760997. The cubic root of 343216221 is about 700.1470582190.

Adding to 343216221 its reverse (122612343), we get a palindrome (465828564).

The spelling of 343216221 in words is "three hundred forty-three million, two hundred sixteen thousand, two hundred twenty-one".