21012110011 has 2 divisors, whose sum is σ = 21012110012. Its totient is φ = 21012110010.

The previous prime is 21012109997. The next prime is 21012110017. The reversal of 21012110011 is 11001121012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21012110011 - 2⁷ = 21012109883 is a prime.

It is a super-2 number, since 2×21012110011² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21012110011.

It is not a weakly prime, because it can be changed into another prime (21012110017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10506055005 + 10506055006.

It is an arithmetic number, because the mean of its divisors is an integer number (10506055006).

Almost surely, 2^21012110011 is an apocalyptic number.

21012110011 is a deficient number, since it is larger than the sum of its proper divisors (1).

21012110011 is an equidigital number, since it uses as much as digits as its factorization.

21012110011 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4, while the sum is 10.

Adding to 21012110011 its reverse (11001121012), we get a palindrome (32013231023).

It can be divided in two parts, 21012 and 110011, that multiplied together give a palindrome (2311551132).

The spelling of 21012110011 in words is "twenty-one billion, twelve million, one hundred ten thousand, eleven".