212120011010221 has 4 divisors (see below), whose sum is σ = 212151856086844. Its totient is φ = 212088165933600.

The previous prime is 212120011010213. The next prime is 212120011010233. The reversal of 212120011010221 is 122010110021212.

212120011010221 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 165681047041225 + 46438963968996 = 12871715^2 + 6814614^2 .

It is a cyclic number.

It is not a de Polignac number, because 212120011010221 - 2³ = 212120011010213 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 212120011010195 and 212120011010204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212120011010291) 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, 15922528320 + ... + 15922541641.

It is an arithmetic number, because the mean of its divisors is an integer number (53037964021711).

Almost surely, 2^{212120011010221} is an apocalyptic number.

It is an amenable number.

212120011010221 is a deficient number, since it is larger than the sum of its proper divisors (31845076623).

212120011010221 is an equidigital number, since it uses as much as digits as its factorization.

212120011010221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31845076622.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 212120011010221 its reverse (122010110021212), we get a palindrome (334130121031433).

It can be divided in two parts, 21212001 and 1010221, that added together give a palindrome (22222222).

The spelling of 212120011010221 in words is "two hundred twelve trillion, one hundred twenty billion, eleven million, ten thousand, two hundred twenty-one".