20212111200 has 72 divisors (see below), whose sum is σ = 65790429768. Its totient is φ = 5389895680.

The previous prime is 20212111187. The next prime is 20212111207. The reversal of 20212111200 is 211121202.

It is a super-2 number, since 2×20212111200² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20212111207) by changing a digit.

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, 4208457 + ... + 4213256.

It is an arithmetic number, because the mean of its divisors is an integer number (913755969).

Almost surely, 2^20212111200 is an apocalyptic number.

20212111200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20212111200 is an abundant number, since it is smaller than the sum of its proper divisors (45578318568).

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

20212111200 is a wasteful number, since it uses less digits than its factorization.

20212111200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8421736 (or 8421723 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 20212111200 its reverse (211121202), we get a palindrome (20423232402).

The spelling of 20212111200 in words is "twenty billion, two hundred twelve million, one hundred eleven thousand, two hundred".