21111529843 has 2 divisors, whose sum is σ = 21111529844. Its totient is φ = 21111529842.

The previous prime is 21111529811. The next prime is 21111529871. The reversal of 21111529843 is 34892511112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21111529843 - 2⁵ = 21111529811 is a prime.

It is not a weakly prime, because it can be changed into another prime (21111529643) 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, 10555764921 + 10555764922.

It is an arithmetic number, because the mean of its divisors is an integer number (10555764922).

Almost surely, 2^21111529843 is an apocalyptic number.

21111529843 is a deficient number, since it is larger than the sum of its proper divisors (1).

21111529843 is an equidigital number, since it uses as much as digits as its factorization.

21111529843 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 17280, while the sum is 37.

The spelling of 21111529843 in words is "twenty-one billion, one hundred eleven million, five hundred twenty-nine thousand, eight hundred forty-three".