21020111110011 has 16 divisors (see below), whose sum is σ = 31771288048640. Its totient is φ = 12254639675040.

The previous prime is 21020111110003. The next prime is 21020111110043. The reversal of 21020111110011 is 11001111102012.

It is not a de Polignac number, because 21020111110011 - 2³ = 21020111110003 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21020111110711) 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 15 ways as a sum of consecutive naturals, for example, 14183609995 + ... + 14183611476.

It is an arithmetic number, because the mean of its divisors is an integer number (1985705503040).

Almost surely, 2^{21020111110011} is an apocalyptic number.

21020111110011 is a deficient number, since it is larger than the sum of its proper divisors (10751176938629).

21020111110011 is a wasteful number, since it uses less digits than its factorization.

21020111110011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28367221506.

The product of its (nonzero) digits is 4, while the sum is 12.

Adding to 21020111110011 its reverse (11001111102012), we get a palindrome (32021222212023).

The spelling of 21020111110011 in words is "twenty-one trillion, twenty billion, one hundred eleven million, one hundred ten thousand, eleven".