212320345 has 32 divisors (see below), whose sum is σ = 277320960. Its totient is φ = 155952000.

The previous prime is 212320343. The next prime is 212320357. The reversal of 212320345 is 543023212.

It is not a de Polignac number, because 212320345 - 2¹ = 212320343 is a prime.

It is not an unprimeable number, because it can be changed into a prime (212320343) 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 31 ways as a sum of consecutive naturals, for example, 1406020 + ... + 1406170.

It is an arithmetic number, because the mean of its divisors is an integer number (8666280).

Almost surely, 2^212320345 is an apocalyptic number.

It is an amenable number.

212320345 is a deficient number, since it is larger than the sum of its proper divisors (65000615).

212320345 is an equidigital number, since it uses as much as digits as its factorization.

212320345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 254 (or 216 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 22.

The square root of 212320345 is about 14571.2163184821. The cubic root of 212320345 is about 596.5733797472.

Adding to 212320345 its reverse (543023212), we get a palindrome (755343557).

The spelling of 212320345 in words is "two hundred twelve million, three hundred twenty thousand, three hundred forty-five".