212305145 has 32 divisors (see below), whose sum is σ = 291782400. Its totient is φ = 146997504.

The previous prime is 212305117. The next prime is 212305151. The reversal of 212305145 is 541503212.

It is a cyclic number.

It is not a de Polignac number, because 212305145 - 2¹⁸ = 212043001 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 212305145.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 126371 + ... + 128039.

It is an arithmetic number, because the mean of its divisors is an integer number (9118200).

Almost surely, 2^212305145 is an apocalyptic number.

It is an amenable number.

212305145 is a deficient number, since it is larger than the sum of its proper divisors (79477255).

212305145 is a wasteful number, since it uses less digits than its factorization.

212305145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1809.

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 212305145 is about 14570.6947329220. The cubic root of 212305145 is about 596.5591431907.

Adding to 212305145 its reverse (541503212), we get a palindrome (753808357).

The spelling of 212305145 in words is "two hundred twelve million, three hundred five thousand, one hundred forty-five".