343221421 has 4 divisors (see below), whose sum is σ = 343298844. Its totient is φ = 343144000.

The previous prime is 343221413. The next prime is 343221427. The reversal of 343221421 is 124122343.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 181575625 + 161645796 = 13475^2 + 12714^2 .

It is a cyclic number.

It is not a de Polignac number, because 343221421 - 2³ = 343221413 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 343221392 and 343221401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (343221427) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31630 + ... + 41071.

It is an arithmetic number, because the mean of its divisors is an integer number (85824711).

Almost surely, 2^343221421 is an apocalyptic number.

It is an amenable number.

343221421 is a deficient number, since it is larger than the sum of its proper divisors (77423).

343221421 is an equidigital number, since it uses as much as digits as its factorization.

343221421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77422.

The product of its digits is 1152, while the sum is 22.

The square root of 343221421 is about 18526.2360181446. The cubic root of 343221421 is about 700.1505941303.

Adding to 343221421 its reverse (124122343), we get a palindrome (467343764).

The spelling of 343221421 in words is "three hundred forty-three million, two hundred twenty-one thousand, four hundred twenty-one".