212021200021 has 4 divisors (see below), whose sum is σ = 217192448844. Its totient is φ = 206849951200.

The previous prime is 212021199979. The next prime is 212021200031. The reversal of 212021200021 is 120002120212.

It is a happy number.

212021200021 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 98903331121 + 113117868900 = 314489^2 + 336330^2 .

It is a cyclic number.

It is not a de Polignac number, because 212021200021 - 2²⁹ = 211484329109 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 212021199974 and 212021200010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212021200031) 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, 2585624350 + ... + 2585624431.

It is an arithmetic number, because the mean of its divisors is an integer number (54298112211).

Almost surely, 2^212021200021 is an apocalyptic number.

It is an amenable number.

212021200021 is a deficient number, since it is larger than the sum of its proper divisors (5171248823).

212021200021 is an equidigital number, since it uses as much as digits as its factorization.

212021200021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5171248822.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 212021200021 its reverse (120002120212), we get a palindrome (332023320233).

The spelling of 212021200021 in words is "two hundred twelve billion, twenty-one million, two hundred thousand, twenty-one".