21200100012012 has 24 divisors (see below), whose sum is σ = 49467164135536. Its totient is φ = 7066662274368.

The previous prime is 21200100011983. The next prime is 21200100012029. The reversal of 21200100012012 is 21021000100212.

It is a super-2 number, since 2×21200100012012² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2326543 + ... + 6914694.

Almost surely, 2^{21200100012012} is an apocalyptic number.

It is an amenable number.

21200100012012 is an abundant number, since it is smaller than the sum of its proper divisors (28267064123524).

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

21200100012012 is a wasteful number, since it uses less digits than its factorization.

21200100012012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9432417 (or 9432415 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 21200100012012 its reverse (21021000100212), we get a palindrome (42221100112224).

The spelling of 21200100012012 in words is "twenty-one trillion, two hundred billion, one hundred million, twelve thousand, twelve".