212908800509 has 4 divisors (see below), whose sum is σ = 212917042716. Its totient is φ = 212900558304.

The previous prime is 212908800473. The next prime is 212908800523. The reversal of 212908800509 is 905008809212.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 120511039609 + 92397760900 = 347147^2 + 303970^2 .

It is a cyclic number.

It is not a de Polignac number, because 212908800509 - 2⁸ = 212908800253 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 212908800509.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212908800529) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4082234 + ... + 4134059.

It is an arithmetic number, because the mean of its divisors is an integer number (53229260679).

Almost surely, 2^212908800509 is an apocalyptic number.

It is an amenable number.

212908800509 is a deficient number, since it is larger than the sum of its proper divisors (8242207).

212908800509 is an equidigital number, since it uses as much as digits as its factorization.

212908800509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8242206.

The product of its (nonzero) digits is 103680, while the sum is 44.

The spelling of 212908800509 in words is "two hundred twelve billion, nine hundred eight million, eight hundred thousand, five hundred nine".