21200021120011 has 32 divisors (see below), whose sum is σ = 23359594503168. Its totient is φ = 19160276889600.

The previous prime is 21200021119933. The next prime is 21200021120029. The reversal of 21200021120011 is 11002112000212.

It is a cyclic number.

It is not a de Polignac number, because 21200021120011 - 2³⁵ = 21165661381643 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21200021119973 and 21200021120000.

It is not an unprimeable number, because it can be changed into a prime (21200021120081) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9716946 + ... + 11696968.

It is an arithmetic number, because the mean of its divisors is an integer number (729987328224).

Almost surely, 2^{21200021120011} is an apocalyptic number.

21200021120011 is a deficient number, since it is larger than the sum of its proper divisors (2159573383157).

21200021120011 is a wasteful number, since it uses less digits than its factorization.

21200021120011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1980331.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 21200021120011 its reverse (11002112000212), we get a palindrome (32202133120223).

The spelling of 21200021120011 in words is "twenty-one trillion, two hundred billion, twenty-one million, one hundred twenty thousand, eleven".