20111100111221 has 8 divisors (see below), whose sum is σ = 23099612476800. Its totient is φ = 17151462261648.

The previous prime is 20111100111197. The next prime is 20111100111259. The reversal of 20111100111221 is 12211100111102.

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 20111100111221 - 2³⁴ = 20093920242037 is a prime.

It is a super-2 number, since 2×20111100111221² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20111100111196 and 20111100111205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20111100141221) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7218627506 + ... + 7218630291.

It is an arithmetic number, because the mean of its divisors is an integer number (2887451559600).

Almost surely, 2^{20111100111221} is an apocalyptic number.

It is an amenable number.

20111100111221 is a deficient number, since it is larger than the sum of its proper divisors (2988512365579).

20111100111221 is a wasteful number, since it uses less digits than its factorization.

20111100111221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14437258003.

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

Adding to 20111100111221 its reverse (12211100111102), we get a palindrome (32322200222323).

The spelling of 20111100111221 in words is "twenty trillion, one hundred eleven billion, one hundred million, one hundred eleven thousand, two hundred twenty-one".