212110022221 has 4 divisors (see below), whose sum is σ = 212678682172. Its totient is φ = 211541362272.

The previous prime is 212110022197. The next prime is 212110022233. The reversal of 212110022221 is 122220011212.

It is a happy number.

212110022221 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 138934362121 + 73175660100 = 372739^2 + 270510^2 .

It is a cyclic number.

It is not a de Polignac number, because 212110022221 - 2⁹ = 212110021709 is a prime.

It is a super-2 number, since 2×212110022221² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 212110022195 and 212110022204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212110022251) 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, 284329416 + ... + 284330161.

It is an arithmetic number, because the mean of its divisors is an integer number (53169670543).

Almost surely, 2^212110022221 is an apocalyptic number.

It is an amenable number.

212110022221 is a deficient number, since it is larger than the sum of its proper divisors (568659951).

212110022221 is an equidigital number, since it uses as much as digits as its factorization.

212110022221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 568659950.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 212110022221 its reverse (122220011212), we get a palindrome (334330033433).

The spelling of 212110022221 in words is "two hundred twelve billion, one hundred ten million, twenty-two thousand, two hundred twenty-one".