211321220113 has 4 divisors (see below), whose sum is σ = 211323706420. Its totient is φ = 211318733808.

The previous prime is 211321220111. The next prime is 211321220147. The reversal of 211321220113 is 311022123112.

211321220113 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 107074891729 + 104246328384 = 327223^2 + 322872^2 .

It is a cyclic number.

It is not a de Polignac number, because 211321220113 - 2¹ = 211321220111 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (211321220111) 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, 1110978 + ... + 1287211.

It is an arithmetic number, because the mean of its divisors is an integer number (52830926605).

Almost surely, 2^211321220113 is an apocalyptic number.

It is an amenable number.

211321220113 is a deficient number, since it is larger than the sum of its proper divisors (2486307).

211321220113 is an equidigital number, since it uses as much as digits as its factorization.

211321220113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2486306.

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 211321220113 its reverse (311022123112), we get a palindrome (522343343225).

The spelling of 211321220113 in words is "two hundred eleven billion, three hundred twenty-one million, two hundred twenty thousand, one hundred thirteen".