21002200112 has 20 divisors (see below), whose sum is σ = 43085396376. Its totient is φ = 9883388160.

The previous prime is 21002200099. The next prime is 21002200117. The reversal of 21002200112 is 21100220012.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21002200093 and 21002200102.

It is not an unprimeable number, because it can be changed into a prime (21002200117) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38606714 + ... + 38607257.

Almost surely, 2^21002200112 is an apocalyptic number.

It is an amenable number.

21002200112 is an abundant number, since it is smaller than the sum of its proper divisors (22083196264).

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

21002200112 is a wasteful number, since it uses less digits than its factorization.

21002200112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77213996 (or 77213990 counting only the distinct ones).

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

Adding to 21002200112 its reverse (21100220012), we get a palindrome (42102420124).

The spelling of 21002200112 in words is "twenty-one billion, two million, two hundred thousand, one hundred twelve".