21111111200011 has 16 divisors (see below), whose sum is σ = 24353129654784. Its totient is φ = 17925638264064.

The previous prime is 21111111199993. The next prime is 21111111200059. The reversal of 21111111200011 is 11000211111112.

It is a cyclic number.

It is not a de Polignac number, because 21111111200011 - 2¹⁵ = 21111111167243 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21111111199964 and 21111111200000.

It is not an unprimeable number, because it can be changed into a prime (21111111200411) 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 15 ways as a sum of consecutive naturals, for example, 28776091 + ... + 29500603.

It is an arithmetic number, because the mean of its divisors is an integer number (1522070603424).

Almost surely, 2^{21111111200011} is an apocalyptic number.

21111111200011 is a deficient number, since it is larger than the sum of its proper divisors (3242018454773).

21111111200011 is a wasteful number, since it uses less digits than its factorization.

21111111200011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 763530.

The product of its (nonzero) digits is 4, while the sum is 13.

Adding to 21111111200011 its reverse (11000211111112), we get a palindrome (32111322311123).

The spelling of 21111111200011 in words is "twenty-one trillion, one hundred eleven billion, one hundred eleven million, two hundred thousand, eleven".