21011122010011 has 4 divisors (see below), whose sum is σ = 24012710868592. Its totient is φ = 18009533151432.

The previous prime is 21011122009973. The next prime is 21011122010063. The reversal of 21011122010011 is 11001022111012.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21011122010011 - 2⁷ = 21011122009883 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21011122009973 and 21011122010000.

It is not an unprimeable number, because it can be changed into a prime (21011123010011) 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, 1500794429280 + ... + 1500794429293.

It is an arithmetic number, because the mean of its divisors is an integer number (6003177717148).

Almost surely, 2^{21011122010011} is an apocalyptic number.

21011122010011 is a deficient number, since it is larger than the sum of its proper divisors (3001588858581).

21011122010011 is an equidigital number, since it uses as much as digits as its factorization.

21011122010011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3001588858580.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 21011122010011 its reverse (11001022111012), we get a palindrome (32012144121023).

The spelling of 21011122010011 in words is "twenty-one trillion, eleven billion, one hundred twenty-two million, ten thousand, eleven".