20111121192 has 64 divisors (see below), whose sum is σ = 51767637120. Its totient is φ = 6505982208.

The previous prime is 20111121187. The next prime is 20111121209. The reversal of 20111121192 is 29112111102.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 324013 + ... + 381059.

It is an arithmetic number, because the mean of its divisors is an integer number (808869330).

Almost surely, 2^20111121192 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20111121192, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25883818560).

20111121192 is an abundant number, since it is smaller than the sum of its proper divisors (31656515928).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20111121192 is a wasteful number, since it uses less digits than its factorization.

20111121192 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57490 (or 57486 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 21.

Adding to 20111121192 its reverse (29112111102), we get a palindrome (49223232294).

The spelling of 20111121192 in words is "twenty billion, one hundred eleven million, one hundred twenty-one thousand, one hundred ninety-two".