21111000210011 has 4 divisors (see below), whose sum is σ = 21111009401832. Its totient is φ = 21110991018192.

The previous prime is 21111000209977. The next prime is 21111000210019. The reversal of 21111000210011 is 11001200011112.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 21111000210011 - 2⁶ = 21111000209947 is a prime.

It is a super-2 number, since 2×21111000210011² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21111000209974 and 21111000210001.

It is not an unprimeable number, because it can be changed into a prime (21111000210019) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2137880 + ... + 6840506.

It is an arithmetic number, because the mean of its divisors is an integer number (5277752350458).

Almost surely, 2^{21111000210011} is an apocalyptic number.

21111000210011 is a deficient number, since it is larger than the sum of its proper divisors (9191821).

21111000210011 is an equidigital number, since it uses as much as digits as its factorization.

21111000210011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9191820.

The product of its (nonzero) digits is 4, while the sum is 11.

Adding to 21111000210011 its reverse (11001200011112), we get a palindrome (32112200221123).

The spelling of 21111000210011 in words is "twenty-one trillion, one hundred eleven billion, two hundred ten thousand, eleven".