212021320193 has 4 divisors (see below), whose sum is σ = 216532412160. Its totient is φ = 207510228228.

The previous prime is 212021320183. The next prime is 212021320201. The reversal of 212021320193 is 391023120212.

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 a de Polignac number, because none of the positive numbers 2^k-212021320193 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (212021320183) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2255545913 + ... + 2255546006.

It is an arithmetic number, because the mean of its divisors is an integer number (54133103040).

Almost surely, 2^212021320193 is an apocalyptic number.

It is an amenable number.

212021320193 is a deficient number, since it is larger than the sum of its proper divisors (4511091967).

212021320193 is an equidigital number, since it uses as much as digits as its factorization.

212021320193 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4511091966.

The product of its (nonzero) digits is 1296, while the sum is 26.

The spelling of 212021320193 in words is "two hundred twelve billion, twenty-one million, three hundred twenty thousand, one hundred ninety-three".