21002000020112 has 20 divisors (see below), whose sum is σ = 40693129923516. Its totient is φ = 10500547136640.

The previous prime is 21002000020093. The next prime is 21002000020139. The reversal of 21002000020112 is 21102000020012.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 4054649395456 + 16947350624656 = 2013616^2 + 4116716^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21002000020093 and 21002000020102.

It is an unprimeable number.

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, 27921839 + ... + 28664142.

Almost surely, 2^{21002000020112} is an apocalyptic number.

It is an amenable number.

21002000020112 is a deficient number, since it is larger than the sum of its proper divisors (19691129903404).

21002000020112 is a wasteful number, since it uses less digits than its factorization.

21002000020112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56609186 (or 56609180 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 21002000020112 its reverse (21102000020012), we get a palindrome (42104000040124).

The spelling of 21002000020112 in words is "twenty-one trillion, two billion, twenty thousand, one hundred twelve".