21002002212112 has 40 divisors (see below), whose sum is σ = 41573085580800. Its totient is φ = 10273635313152.

The previous prime is 21002002212109. The next prime is 21002002212119. The reversal of 21002002212112 is 21121220020012.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is not an unprimeable number, because it can be changed into a prime (21002002212119) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3390312 + ... + 7314247.

It is an arithmetic number, because the mean of its divisors is an integer number (1039327139520).

Almost surely, 2^{21002002212112} is an apocalyptic number.

It is an amenable number.

21002002212112 is a deficient number, since it is larger than the sum of its proper divisors (20571083368688).

21002002212112 is a wasteful number, since it uses less digits than its factorization.

21002002212112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10707223 (or 10707217 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21002002212112 its reverse (21121220020012), we get a palindrome (42123222232124).

The spelling of 21002002212112 in words is "twenty-one trillion, two billion, two million, two hundred twelve thousand, one hundred twelve".