21111030013 has 4 divisors (see below), whose sum is σ = 21509351388. Its totient is φ = 20712708640.

The previous prime is 21111029993. The next prime is 21111030019. The reversal of 21111030013 is 31003011112.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 16765847289 + 4345182724 = 129483^2 + 65918^2 .

It is a cyclic number.

It is not a de Polignac number, because 21111030013 - 2⁹ = 21111029501 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21111029975 and 21111030002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21111030019) 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 in 3 ways as a sum of consecutive naturals, for example, 199160608 + ... + 199160713.

It is an arithmetic number, because the mean of its divisors is an integer number (5377337847).

Almost surely, 2^21111030013 is an apocalyptic number.

It is an amenable number.

21111030013 is a deficient number, since it is larger than the sum of its proper divisors (398321375).

21111030013 is an equidigital number, since it uses as much as digits as its factorization.

21111030013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 398321374.

The product of its (nonzero) digits is 18, while the sum is 13.

Adding to 21111030013 its reverse (31003011112), we get a palindrome (52114041125).

The spelling of 21111030013 in words is "twenty-one billion, one hundred eleven million, thirty thousand, thirteen".