21111011109983 has 2 divisors, whose sum is σ = 21111011109984. Its totient is φ = 21111011109982.

The previous prime is 21111011109977. The next prime is 21111011110019. The reversal of 21111011109983 is 38990111011112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21111011109983 - 2⁶ = 21111011109919 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21111011109973) 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, 10555505554991 + 10555505554992.

It is an arithmetic number, because the mean of its divisors is an integer number (10555505554992).

Almost surely, 2^{21111011109983} is an apocalyptic number.

21111011109983 is a deficient number, since it is larger than the sum of its proper divisors (1).

21111011109983 is an equidigital number, since it uses as much as digits as its factorization.

21111011109983 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3888, while the sum is 38.

The spelling of 21111011109983 in words is "twenty-one trillion, one hundred eleven billion, eleven million, one hundred nine thousand, nine hundred eighty-three".