343211221 has 4 divisors (see below), whose sum is σ = 358133472. Its totient is φ = 328288972.

The previous prime is 343211207. The next prime is 343211237. The reversal of 343211221 is 122112343.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 343211221 - 2⁵ = 343211189 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 (343211291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7461091 + ... + 7461136.

It is an arithmetic number, because the mean of its divisors is an integer number (89533368).

Almost surely, 2^343211221 is an apocalyptic number.

It is an amenable number.

343211221 is a deficient number, since it is larger than the sum of its proper divisors (14922251).

343211221 is a wasteful number, since it uses less digits than its factorization.

343211221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14922250.

The product of its digits is 288, while the sum is 19.

The square root of 343211221 is about 18525.9607308231. The cubic root of 343211221 is about 700.1436582707.

Adding to 343211221 its reverse (122112343), we get a palindrome (465323564).

The spelling of 343211221 in words is "three hundred forty-three million, two hundred eleven thousand, two hundred twenty-one".