21120221011 has 2 divisors, whose sum is σ = 21120221012. Its totient is φ = 21120221010.

The previous prime is 21120221009. The next prime is 21120221027. The reversal of 21120221011 is 11012202112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21120221011 - 2¹ = 21120221009 is a prime.

Together with 21120221009, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 21120220982 and 21120221000.

It is not a weakly prime, because it can be changed into another prime (21120221041) 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 as a sum of consecutive naturals, namely, 10560110505 + 10560110506.

It is an arithmetic number, because the mean of its divisors is an integer number (10560110506).

Almost surely, 2^21120221011 is an apocalyptic number.

21120221011 is a deficient number, since it is larger than the sum of its proper divisors (1).

21120221011 is an equidigital number, since it uses as much as digits as its factorization.

21120221011 is an odious number, because the sum of its binary digits is odd.

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

Adding to 21120221011 its reverse (11012202112), we get a palindrome (32132423123).

The spelling of 21120221011 in words is "twenty-one billion, one hundred twenty million, two hundred twenty-one thousand, eleven".