20421050011 has 2 divisors, whose sum is σ = 20421050012. Its totient is φ = 20421050010.

The previous prime is 20421050009. The next prime is 20421050017. The reversal of 20421050011 is 11005012402.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20421050011 - 2¹ = 20421050009 is a prime.

Together with 20421050009, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (20421050017) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10210525005 + 10210525006.

It is an arithmetic number, because the mean of its divisors is an integer number (10210525006).

Almost surely, 2^20421050011 is an apocalyptic number.

20421050011 is a deficient number, since it is larger than the sum of its proper divisors (1).

20421050011 is an equidigital number, since it uses as much as digits as its factorization.

20421050011 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 80, while the sum is 16.

Adding to 20421050011 its reverse (11005012402), we get a palindrome (31426062413).

The spelling of 20421050011 in words is "twenty billion, four hundred twenty-one million, fifty thousand, eleven".