212012011021 has 4 divisors (see below), whose sum is σ = 212029958044. Its totient is φ = 211994064000.

The previous prime is 212012010953. The next prime is 212012011033. The reversal of 212012011021 is 120110210212.

212012011021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 130722018025 + 81289992996 = 361555^2 + 285114^2 .

It is a cyclic number.

It is not a de Polignac number, because 212012011021 - 2²⁵ = 211978456589 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 212012010992 and 212012011010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212012012021) 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, 8955780 + ... + 8979421.

It is an arithmetic number, because the mean of its divisors is an integer number (53007489511).

Almost surely, 2^212012011021 is an apocalyptic number.

It is an amenable number.

212012011021 is a deficient number, since it is larger than the sum of its proper divisors (17947023).

212012011021 is a wasteful number, since it uses less digits than its factorization.

212012011021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17947022.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 212012011021 its reverse (120110210212), we get a palindrome (332122221233).

The spelling of 212012011021 in words is "two hundred twelve billion, twelve million, eleven thousand, twenty-one".