20111111213 has 16 divisors (see below), whose sum is σ = 21278538240. Its totient is φ = 18981864000.

The previous prime is 20111111191. The next prime is 20111111227. The reversal of 20111111213 is 31211111102.

It is a cyclic number.

It is not a de Polignac number, because 20111111213 - 2¹⁰ = 20111110189 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 (20111111233) 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 15 ways as a sum of consecutive naturals, for example, 161843 + ... + 257711.

It is an arithmetic number, because the mean of its divisors is an integer number (1329908640).

Almost surely, 2^20111111213 is an apocalyptic number.

It is an amenable number.

20111111213 is a deficient number, since it is larger than the sum of its proper divisors (1167427027).

20111111213 is a wasteful number, since it uses less digits than its factorization.

20111111213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96068.

The product of its (nonzero) digits is 12, while the sum is 14.

Adding to 20111111213 its reverse (31211111102), we get a palindrome (51322222315).

The spelling of 20111111213 in words is "twenty billion, one hundred eleven million, one hundred eleven thousand, two hundred thirteen".