21221202002112 has 168 divisors, whose sum is σ = 70204560115872. Its totient is φ = 6003168768000.

The previous prime is 21221202002111. The next prime is 21221202002129. The reversal of 21221202002112 is 21120020212212.

It is a happy number.

21221202002112 is a `hidden beast` number, since 212 + 21 + 20 + 200 + 211 + 2 = 666.

It is a tau number, because it is divible by the number of its divisors (168).

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

It is not an unprimeable number, because it can be changed into a prime (21221202002111) 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 23 ways as a sum of consecutive naturals, for example, 25648189 + ... + 26462652.

It is an arithmetic number, because the mean of its divisors is an integer number (417884286404).

Almost surely, 2^{21221202002112} is an apocalyptic number.

It is an amenable number.

21221202002112 is an abundant number, since it is smaller than the sum of its proper divisors (48983358113760).

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

21221202002112 is a wasteful number, since it uses less digits than its factorization.

21221202002112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52110967 (or 52110954 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 21221202002112 its reverse (21120020212212), we get a palindrome (42341222214324).

The spelling of 21221202002112 in words is "twenty-one trillion, two hundred twenty-one billion, two hundred two million, two thousand, one hundred twelve".