20111101021211 has 4 divisors (see below), whose sum is σ = 20318431959672. Its totient is φ = 19903770082752.

The previous prime is 20111101021183. The next prime is 20111101021241. The reversal of 20111101021211 is 11212010111102.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20111101021211 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20111101021241) 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, 103665469085 + ... + 103665469278.

It is an arithmetic number, because the mean of its divisors is an integer number (5079607989918).

Almost surely, 2^{20111101021211} is an apocalyptic number.

20111101021211 is a deficient number, since it is larger than the sum of its proper divisors (207330938461).

20111101021211 is an equidigital number, since it uses as much as digits as its factorization.

20111101021211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 207330938460.

The product of its (nonzero) digits is 8, while the sum is 14.

Adding to 20111101021211 its reverse (11212010111102), we get a palindrome (31323111132313).

The spelling of 20111101021211 in words is "twenty trillion, one hundred eleven billion, one hundred one million, twenty-one thousand, two hundred eleven".