21111440023 has 2 divisors, whose sum is σ = 21111440024. Its totient is φ = 21111440022.

The previous prime is 21111439991. The next prime is 21111440071. The reversal of 21111440023 is 32004411112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21111440023 - 2⁵ = 21111439991 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21111440083) 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, 10555720011 + 10555720012.

It is an arithmetic number, because the mean of its divisors is an integer number (10555720012).

Almost surely, 2^21111440023 is an apocalyptic number.

21111440023 is a deficient number, since it is larger than the sum of its proper divisors (1).

21111440023 is an equidigital number, since it uses as much as digits as its factorization.

21111440023 is an odious number, because the sum of its binary digits is odd.

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

Adding to 21111440023 its reverse (32004411112), we get a palindrome (53115851135).

The spelling of 21111440023 in words is "twenty-one billion, one hundred eleven million, four hundred forty thousand, twenty-three".