346206221 has 2 divisors, whose sum is σ = 346206222. Its totient is φ = 346206220.

The previous prime is 346206187. The next prime is 346206253. The reversal of 346206221 is 122602643.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 192793225 + 153412996 = 13885^2 + 12386^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-346206221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (346206821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 173103110 + 173103111.

It is an arithmetic number, because the mean of its divisors is an integer number (173103111).

Almost surely, 2^346206221 is an apocalyptic number.

It is an amenable number.

346206221 is a deficient number, since it is larger than the sum of its proper divisors (1).

346206221 is an equidigital number, since it uses as much as digits as its factorization.

346206221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3456, while the sum is 26.

The square root of 346206221 is about 18606.6176668410. The cubic root of 346206221 is about 702.1743417821.

Adding to 346206221 its reverse (122602643), we get a palindrome (468808864).

The spelling of 346206221 in words is "three hundred forty-six million, two hundred six thousand, two hundred twenty-one".