21221121200112 has 40 divisors (see below), whose sum is σ = 60912477520080. Its totient is φ = 7073707066560.

The previous prime is 21221121200107. The next prime is 21221121200131. The reversal of 21221121200112 is 21100212112212.

21221121200112 is a `hidden beast` number, since 212 + 21 + 121 + 200 + 112 = 666.

It is a super-2 number, since 2×21221121200112² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24561482439 + ... + 24561483302.

It is an arithmetic number, because the mean of its divisors is an integer number (1522811938002).

Almost surely, 2^{21221121200112} is an apocalyptic number.

It is an amenable number.

21221121200112 is an abundant number, since it is smaller than the sum of its proper divisors (39691356319968).

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

21221121200112 is a wasteful number, since it uses less digits than its factorization.

21221121200112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49122965758 (or 49122965746 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 21221121200112 its reverse (21100212112212), we get a palindrome (42321333312324).

The spelling of 21221121200112 in words is "twenty-one trillion, two hundred twenty-one billion, one hundred twenty-one million, two hundred thousand, one hundred twelve".