21122120011 has 2 divisors, whose sum is σ = 21122120012. Its totient is φ = 21122120010.

The previous prime is 21122120003. The next prime is 21122120027. The reversal of 21122120011 is 11002122112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21122120011 - 2³ = 21122120003 is a prime.

It is a super-2 number, since 2×21122120011² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21122119973 and 21122120000.

It is not a weakly prime, because it can be changed into another prime (21122120911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10561060005 + 10561060006.

It is an arithmetic number, because the mean of its divisors is an integer number (10561060006).

Almost surely, 2^21122120011 is an apocalyptic number.

21122120011 is a deficient number, since it is larger than the sum of its proper divisors (1).

21122120011 is an equidigital number, since it uses as much as digits as its factorization.

21122120011 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 21122120011 its reverse (11002122112), we get a palindrome (32124242123).

The spelling of 21122120011 in words is "twenty-one billion, one hundred twenty-two million, one hundred twenty thousand, eleven".