211122102122221 has 4 divisors (see below), whose sum is σ = 211122975270844. Its totient is φ = 211121228973600.

The previous prime is 211122102122213. The next prime is 211122102122227. The reversal of 211122102122221 is 122221201221112.

211122102122221 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 81195615961321 + 129926486160900 = 9010861^2 + 11398530^2 .

It is a cyclic number.

It is not a de Polignac number, because 211122102122221 - 2³ = 211122102122213 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 211122102122192 and 211122102122201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211122102122227) 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, 436211520 + ... + 436695241.

It is an arithmetic number, because the mean of its divisors is an integer number (52780743817711).

Almost surely, 2^{211122102122221} is an apocalyptic number.

It is an amenable number.

211122102122221 is a deficient number, since it is larger than the sum of its proper divisors (873148623).

211122102122221 is an equidigital number, since it uses as much as digits as its factorization.

211122102122221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 873148622.

The product of its (nonzero) digits is 256, while the sum is 22.

Adding to 211122102122221 its reverse (122221201221112), we get a palindrome (333343303343333).

The spelling of 211122102122221 in words is "two hundred eleven trillion, one hundred twenty-two billion, one hundred two million, one hundred twenty-two thousand, two hundred twenty-one".