21012200112 has 20 divisors (see below), whose sum is σ = 54281517080. Its totient is φ = 7004066688.

The previous prime is 21012200101. The next prime is 21012200119. The reversal of 21012200112 is 21100221012.

It is a super-3 number, since 3×21012200112³ (a number of 32 digits) contains 333 as substring.

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

It is not an unprimeable number, because it can be changed into a prime (21012200119) 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 3 ways as a sum of consecutive naturals, for example, 218877037 + ... + 218877132.

It is an arithmetic number, because the mean of its divisors is an integer number (2714075854).

Almost surely, 2^21012200112 is an apocalyptic number.

It is an amenable number.

21012200112 is an abundant number, since it is smaller than the sum of its proper divisors (33269316968).

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

21012200112 is a wasteful number, since it uses less digits than its factorization.

21012200112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 437754180 (or 437754174 counting only the distinct ones).

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

Adding to 21012200112 its reverse (21100221012), we get a palindrome (42112421124).

The spelling of 21012200112 in words is "twenty-one billion, twelve million, two hundred thousand, one hundred twelve".