20111220120111 has 16 divisors (see below), whose sum is σ = 27276687110400. Its totient is φ = 13176737206848.

The previous prime is 20111220120053. The next prime is 20111220120133. The reversal of 20111220120111 is 11102102211102.

It is a happy number.

It is not a de Polignac number, because 20111220120111 - 2³¹ = 20109072636463 is a prime.

It is a super-2 number, since 2×20111220120111² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20111220120011) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14406211 + ... + 15740436.

It is an arithmetic number, because the mean of its divisors is an integer number (1704792944400).

Almost surely, 2^{20111220120111} is an apocalyptic number.

20111220120111 is a deficient number, since it is larger than the sum of its proper divisors (7165466990289).

20111220120111 is a wasteful number, since it uses less digits than its factorization.

20111220120111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30150478.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 20111220120111 its reverse (11102102211102), we get a palindrome (31213322331213).

The spelling of 20111220120111 in words is "twenty trillion, one hundred eleven billion, two hundred twenty million, one hundred twenty thousand, one hundred eleven".