211223104013 has 4 divisors (see below), whose sum is σ = 211224102108. Its totient is φ = 211222105920.

The previous prime is 211223104009. The next prime is 211223104033. The reversal of 211223104013 is 310401322112.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 148574015209 + 62649088804 = 385453^2 + 250298^2 .

It is a cyclic number.

It is not a de Polignac number, because 211223104013 - 2² = 211223104009 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211223104033) 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, 42206 + ... + 651327.

It is an arithmetic number, because the mean of its divisors is an integer number (52806025527).

Almost surely, 2^211223104013 is an apocalyptic number.

It is an amenable number.

211223104013 is a deficient number, since it is larger than the sum of its proper divisors (998095).

211223104013 is an equidigital number, since it uses as much as digits as its factorization.

211223104013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 998094.

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 211223104013 its reverse (310401322112), we get a palindrome (521624426125).

The spelling of 211223104013 in words is "two hundred eleven billion, two hundred twenty-three million, one hundred four thousand, thirteen".