21111010020011 has 16 divisors (see below), whose sum is σ = 21852359884800. Its totient is φ = 20370556341408.

The previous prime is 21111010019977. The next prime is 21111010020047. The reversal of 21111010020011 is 11002001011112.

It is a cyclic number.

It is not a de Polignac number, because 21111010020011 - 2⁶ = 21111010019947 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21111010019974 and 21111010020001.

It is not an unprimeable number, because it can be changed into a prime (21111010320011) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 334516886 + ... + 334579988.

It is an arithmetic number, because the mean of its divisors is an integer number (1365772492800).

Almost surely, 2^{21111010020011} is an apocalyptic number.

21111010020011 is a deficient number, since it is larger than the sum of its proper divisors (741349864789).

21111010020011 is a wasteful number, since it uses less digits than its factorization.

21111010020011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70018.

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

Adding to 21111010020011 its reverse (11002001011112), we get a palindrome (32113011031123).

The spelling of 21111010020011 in words is "twenty-one trillion, one hundred eleven billion, ten million, twenty thousand, eleven".