20111121021211 has 8 divisors (see below), whose sum is σ = 22156626580848. Its totient is φ = 18101819100000.

The previous prime is 20111121021161. The next prime is 20111121021223. The reversal of 20111121021211 is 11212012111102.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20111121021211 - 2²⁵ = 20111087466779 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20111121061211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9050908440 + ... + 9050910661.

It is an arithmetic number, because the mean of its divisors is an integer number (2769578322606).

Almost surely, 2^{20111121021211} is an apocalyptic number.

20111121021211 is a deficient number, since it is larger than the sum of its proper divisors (2045505559637).

20111121021211 is a wasteful number, since it uses less digits than its factorization.

20111121021211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18101819213.

The product of its (nonzero) digits is 16, while the sum is 16.

Adding to 20111121021211 its reverse (11212012111102), we get a palindrome (31323133132313).

The spelling of 20111121021211 in words is "twenty trillion, one hundred eleven billion, one hundred twenty-one million, twenty-one thousand, two hundred eleven".