21203103113 has 2 divisors, whose sum is σ = 21203103114. Its totient is φ = 21203103112.

The previous prime is 21203103107. The next prime is 21203103133. The reversal of 21203103113 is 31130130212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12603879289 + 8599223824 = 112267^2 + 92732^2 .

It is a cyclic number.

It is not a de Polignac number, because 21203103113 - 2³² = 16908135817 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21203103091 and 21203103100.

It is not a weakly prime, because it can be changed into another prime (21203103133) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10601551556 + 10601551557.

It is an arithmetic number, because the mean of its divisors is an integer number (10601551557).

Almost surely, 2^21203103113 is an apocalyptic number.

It is an amenable number.

21203103113 is a deficient number, since it is larger than the sum of its proper divisors (1).

21203103113 is an equidigital number, since it uses as much as digits as its factorization.

21203103113 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108, while the sum is 17.

Adding to 21203103113 its reverse (31130130212), we get a palindrome (52333233325).

The spelling of 21203103113 in words is "twenty-one billion, two hundred three million, one hundred three thousand, one hundred thirteen".