20111211221101 has 48 divisors (see below), whose sum is σ = 27152561111040. Its totient is φ = 14464684503360.

The previous prime is 20111211221081. The next prime is 20111211221113. The reversal of 20111211221101 is 10112211211102.

It is not a de Polignac number, because 20111211221101 - 2¹³ = 20111211212909 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20111211221191) 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 47 ways as a sum of consecutive naturals, for example, 254794120 + ... + 254873038.

It is an arithmetic number, because the mean of its divisors is an integer number (565678356480).

Almost surely, 2^{20111211221101} is an apocalyptic number.

It is an amenable number.

20111211221101 is a deficient number, since it is larger than the sum of its proper divisors (7041349889939).

20111211221101 is a wasteful number, since it uses less digits than its factorization.

20111211221101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98546 (or 98533 counting only the distinct ones).

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

Adding to 20111211221101 its reverse (10112211211102), we get a palindrome (30223422432203).

Subtracting from 20111211221101 its reverse (10112211211102), we obtain a palindrome (9999000009999).

The spelling of 20111211221101 in words is "twenty trillion, one hundred eleven billion, two hundred eleven million, two hundred twenty-one thousand, one hundred one".