20111013211 has 4 divisors (see below), whose sum is σ = 20111300712. Its totient is φ = 20110725712.

The previous prime is 20111013199. The next prime is 20111013271. The reversal of 20111013211 is 11231011102.

It is a happy number.

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 is a cyclic number.

It is not a de Polignac number, because 20111013211 - 2¹⁵ = 20110980443 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20111013191 and 20111013200.

It is not an unprimeable number, because it can be changed into a prime (20111013271) 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, 36600 + ... + 203866.

It is an arithmetic number, because the mean of its divisors is an integer number (5027825178).

Almost surely, 2^20111013211 is an apocalyptic number.

20111013211 is a deficient number, since it is larger than the sum of its proper divisors (287501).

20111013211 is a wasteful number, since it uses less digits than its factorization.

20111013211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 287500.

The product of its (nonzero) digits is 12, while the sum is 13.

Adding to 20111013211 its reverse (11231011102), we get a palindrome (31342024313).

The spelling of 20111013211 in words is "twenty billion, one hundred eleven million, thirteen thousand, two hundred eleven".