212243552718721 has 4 divisors (see below), whose sum is σ = 212279827472944. Its totient is φ = 212207277964500.

The previous prime is 212243552718707. The next prime is 212243552718749. The reversal of 212243552718721 is 127817255342212.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 212243552718721 - 2¹⁹ = 212243552194433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (212243550718721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18137368335 + ... + 18137380036.

It is an arithmetic number, because the mean of its divisors is an integer number (53069956868236).

Almost surely, 2^{212243552718721} is an apocalyptic number.

It is an amenable number.

212243552718721 is a deficient number, since it is larger than the sum of its proper divisors (36274754223).

212243552718721 is an equidigital number, since it uses as much as digits as its factorization.

212243552718721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36274754222.

The product of its digits is 3763200, while the sum is 52.

The spelling of 212243552718721 in words is "two hundred twelve trillion, two hundred forty-three billion, five hundred fifty-two million, seven hundred eighteen thousand, seven hundred twenty-one".