211122020201221 has 4 divisors (see below), whose sum is σ = 211122467635500. Its totient is φ = 211121572766944.

The previous prime is 211122020201201. The next prime is 211122020201227. The reversal of 211122020201221 is 122102020221112.

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 162218712453121 + 48903307748100 = 12736511^2 + 6993090^2 .

It is a cyclic number.

It is not a de Polignac number, because 211122020201221 - 2⁹ = 211122020200709 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211122020201227) 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, 223008616 + ... + 223953313.

It is an arithmetic number, because the mean of its divisors is an integer number (52780616908875).

Almost surely, 2^{211122020201221} is an apocalyptic number.

It is an amenable number.

211122020201221 is a deficient number, since it is larger than the sum of its proper divisors (447434279).

211122020201221 is an equidigital number, since it uses as much as digits as its factorization.

211122020201221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 447434278.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 211122020201221 its reverse (122102020221112), we get a palindrome (333224040422333).

The spelling of 211122020201221 in words is "two hundred eleven trillion, one hundred twenty-two billion, twenty million, two hundred one thousand, two hundred twenty-one".