212012203121 has 4 divisors (see below), whose sum is σ = 212028483492. Its totient is φ = 211995922752.

The previous prime is 212012203111. The next prime is 212012203153. The reversal of 212012203121 is 121302210212.

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 167084737600 + 44927465521 = 408760^2 + 211961^2 .

It is a cyclic number.

It is not a de Polignac number, because 212012203121 - 2¹⁰ = 212012202097 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 212012203121.

It is not an unprimeable number, because it can be changed into a prime (212012203111) 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, 8120636 + ... + 8146701.

It is an arithmetic number, because the mean of its divisors is an integer number (53007120873).

Almost surely, 2^212012203121 is an apocalyptic number.

It is an amenable number.

212012203121 is a deficient number, since it is larger than the sum of its proper divisors (16280371).

212012203121 is a wasteful number, since it uses less digits than its factorization.

212012203121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16280370.

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 212012203121 its reverse (121302210212), we get a palindrome (333314413333).

The spelling of 212012203121 in words is "two hundred twelve billion, twelve million, two hundred three thousand, one hundred twenty-one".