20111211200 has 84 divisors (see below), whose sum is σ = 52090761960. Its totient is φ = 7621079040.

The previous prime is 20111211199. The next prime is 20111211313. The reversal of 20111211200 is 211211102.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 300377 + ... + 361176.

Almost surely, 2^20111211200 is an apocalyptic number.

20111211200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20111211200 is an abundant number, since it is smaller than the sum of its proper divisors (31979550760).

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

20111211200 is a wasteful number, since it uses less digits than its factorization.

20111211200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 661594 (or 661579 counting only the distinct ones).

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

Adding to 20111211200 its reverse (211211102), we get a palindrome (20322422302).

The spelling of 20111211200 in words is "twenty billion, one hundred eleven million, two hundred eleven thousand, two hundred".