21440424223111 has 2 divisors, whose sum is σ = 21440424223112. Its totient is φ = 21440424223110.

The previous prime is 21440424223091. The next prime is 21440424223123. The reversal of 21440424223111 is 11132242404412.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21440424223111 - 2⁹ = 21440424222599 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21440424223151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10720212111555 + 10720212111556.

It is an arithmetic number, because the mean of its divisors is an integer number (10720212111556).

Almost surely, 2^{21440424223111} is an apocalyptic number.

21440424223111 is a deficient number, since it is larger than the sum of its proper divisors (1).

21440424223111 is an equidigital number, since it uses as much as digits as its factorization.

21440424223111 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12288, while the sum is 31.

Adding to 21440424223111 its reverse (11132242404412), we get a palindrome (32572666627523).

The spelling of 21440424223111 in words is "twenty-one trillion, four hundred forty billion, four hundred twenty-four million, two hundred twenty-three thousand, one hundred eleven".