21040011011 has 2 divisors, whose sum is σ = 21040011012. Its totient is φ = 21040011010.

The previous prime is 21040010989. The next prime is 21040011043. The reversal of 21040011011 is 11011004012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21040011011 - 2⁶ = 21040010947 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21040010983 and 21040011001.

It is not a weakly prime, because it can be changed into another prime (21040011071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10520005505 + 10520005506.

It is an arithmetic number, because the mean of its divisors is an integer number (10520005506).

Almost surely, 2^21040011011 is an apocalyptic number.

21040011011 is a deficient number, since it is larger than the sum of its proper divisors (1).

21040011011 is an equidigital number, since it uses as much as digits as its factorization.

21040011011 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 21040011011 its reverse (11011004012), we get a palindrome (32051015023).

It can be divided in two parts, 2104001 and 1011, that added together give a palindrome (2105012).

The spelling of 21040011011 in words is "twenty-one billion, forty million, eleven thousand, eleven".