213105345 has 16 divisors (see below), whose sum is σ = 346749120. Its totient is φ = 111729344.

The previous prime is 213105337. The next prime is 213105367. The reversal of 213105345 is 543501312.

It is a cyclic number.

It is not a de Polignac number, because 213105345 - 2³ = 213105337 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 119514 + ... + 121283.

It is an arithmetic number, because the mean of its divisors is an integer number (21671820).

Almost surely, 2^213105345 is an apocalyptic number.

It is an amenable number.

213105345 is a deficient number, since it is larger than the sum of its proper divisors (133643775).

213105345 is a wasteful number, since it uses less digits than its factorization.

213105345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 240864.

The product of its (nonzero) digits is 1800, while the sum is 24.

The square root of 213105345 is about 14598.1281334286. The cubic root of 213105345 is about 597.3077011701.

Adding to 213105345 its reverse (543501312), we get a palindrome (756606657).

The spelling of 213105345 in words is "two hundred thirteen million, one hundred five thousand, three hundred forty-five".