345246221 has 2 divisors, whose sum is σ = 345246222. Its totient is φ = 345246220.

The previous prime is 345246211. The next prime is 345246227. The reversal of 345246221 is 122642543.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 294637225 + 50608996 = 17165^2 + 7114^2 .

It is a cyclic number.

It is not a de Polignac number, because 345246221 - 2⁶ = 345246157 is a prime.

It is a super-2 number, since 2×345246221² = 238389906229561682, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (345246227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 172623110 + 172623111.

It is an arithmetic number, because the mean of its divisors is an integer number (172623111).

Almost surely, 2^345246221 is an apocalyptic number.

It is an amenable number.

345246221 is a deficient number, since it is larger than the sum of its proper divisors (1).

345246221 is an equidigital number, since it uses as much as digits as its factorization.

345246221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11520, while the sum is 29.

The square root of 345246221 is about 18580.8024853611. The cubic root of 345246221 is about 701.5247179925.

Adding to 345246221 its reverse (122642543), we get a palindrome (467888764).

The spelling of 345246221 in words is "three hundred forty-five million, two hundred forty-six thousand, two hundred twenty-one".