21113424443429 has 2 divisors, whose sum is σ = 21113424443430. Its totient is φ = 21113424443428.

The previous prime is 21113424443317. The next prime is 21113424443467. The reversal of 21113424443429 is 92434442431112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19391560852225 + 1721863591204 = 4403585^2 + 1312198^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21113424443429 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21113424443429.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21113424443029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10556712221714 + 10556712221715.

It is an arithmetic number, because the mean of its divisors is an integer number (10556712221715).

Almost surely, 2^{21113424443429} is an apocalyptic number.

It is an amenable number.

21113424443429 is a deficient number, since it is larger than the sum of its proper divisors (1).

21113424443429 is an equidigital number, since it uses as much as digits as its factorization.

21113424443429 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 663552, while the sum is 44.

The spelling of 21113424443429 in words is "twenty-one trillion, one hundred thirteen billion, four hundred twenty-four million, four hundred forty-three thousand, four hundred twenty-nine".