212010112021 has 4 divisors (see below), whose sum is σ = 213235604172. Its totient is φ = 210784619872.

The previous prime is 212010112007. The next prime is 212010112081. The reversal of 212010112021 is 120211010212.

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 147805647025 + 64204464996 = 384455^2 + 253386^2 .

It is a cyclic number.

It is not a de Polignac number, because 212010112021 - 2²³ = 212001723413 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 212010111992 and 212010112010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212010112081) 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, 612745816 + ... + 612746161.

It is an arithmetic number, because the mean of its divisors is an integer number (53308901043).

Almost surely, 2^212010112021 is an apocalyptic number.

It is an amenable number.

212010112021 is a deficient number, since it is larger than the sum of its proper divisors (1225492151).

212010112021 is a wasteful number, since it uses less digits than its factorization.

212010112021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1225492150.

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

Adding to 212010112021 its reverse (120211010212), we get a palindrome (332221122233).

The spelling of 212010112021 in words is "two hundred twelve billion, ten million, one hundred twelve thousand, twenty-one".