21144320011 has 2 divisors, whose sum is σ = 21144320012. Its totient is φ = 21144320010.

The previous prime is 21144319997. The next prime is 21144320023. The reversal of 21144320011 is 11002344112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21144320011 - 2⁵ = 21144319979 is a prime.

It is not a weakly prime, because it can be changed into another prime (21144350011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10572160005 + 10572160006.

It is an arithmetic number, because the mean of its divisors is an integer number (10572160006).

Almost surely, 2^21144320011 is an apocalyptic number.

21144320011 is a deficient number, since it is larger than the sum of its proper divisors (1).

21144320011 is an equidigital number, since it uses as much as digits as its factorization.

21144320011 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 21144320011 its reverse (11002344112), we get a palindrome (32146664123).

The spelling of 21144320011 in words is "twenty-one billion, one hundred forty-four million, three hundred twenty thousand, eleven".