21113440043 has 2 divisors, whose sum is σ = 21113440044. Its totient is φ = 21113440042.

The previous prime is 21113440039. The next prime is 21113440121. The reversal of 21113440043 is 34004431112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21113440043 - 2² = 21113440039 is a prime.

It is not a weakly prime, because it can be changed into another prime (21113440013) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10556720021 + 10556720022.

It is an arithmetic number, because the mean of its divisors is an integer number (10556720022).

Almost surely, 2^21113440043 is an apocalyptic number.

21113440043 is a deficient number, since it is larger than the sum of its proper divisors (1).

21113440043 is an equidigital number, since it uses as much as digits as its factorization.

21113440043 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1152, while the sum is 23.

Adding to 21113440043 its reverse (34004431112), we get a palindrome (55117871155).

The spelling of 21113440043 in words is "twenty-one billion, one hundred thirteen million, four hundred forty thousand, forty-three".