212817856204799 has 4 divisors (see below), whose sum is σ = 212929806683400. Its totient is φ = 212705905726200.

The previous prime is 212817856204781. The next prime is 212817856204823. The reversal of 212817856204799 is 997402658718212.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-212817856204799 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212817856204399) 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, 55975236449 + ... + 55975240250.

It is an arithmetic number, because the mean of its divisors is an integer number (53232451670850).

Almost surely, 2^{212817856204799} is an apocalyptic number.

212817856204799 is a deficient number, since it is larger than the sum of its proper divisors (111950478601).

212817856204799 is a wasteful number, since it uses less digits than its factorization.

212817856204799 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111950478600.

The product of its (nonzero) digits is 243855360, while the sum is 71.

The spelling of 212817856204799 in words is "two hundred twelve trillion, eight hundred seventeen billion, eight hundred fifty-six million, two hundred four thousand, seven hundred ninety-nine".