20111121200 has 60 divisors (see below), whose sum is σ = 48533851968. Its totient is φ = 8008339200.

The previous prime is 20111121187. The next prime is 20111121209. The reversal of 20111121200 is 212111102.

It is not an unprimeable number, because it can be changed into a prime (20111121209) 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 11 ways as a sum of consecutive naturals, for example, 23531 + ... + 201930.

Almost surely, 2^20111121200 is an apocalyptic number.

20111121200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20111121200 is an abundant number, since it is smaller than the sum of its proper divisors (28422730768).

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

20111121200 is a wasteful number, since it uses less digits than its factorization.

20111121200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 225702 (or 225691 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 20111121200 its reverse (212111102), we get a palindrome (20323232302).

It can be divided in two parts, 2011 and 1121200, that added together give a palindrome (1123211).

The spelling of 20111121200 in words is "twenty billion, one hundred eleven million, one hundred twenty-one thousand, two hundred".