21101320103 has 2 divisors, whose sum is σ = 21101320104. Its totient is φ = 21101320102.

The previous prime is 21101320081. The next prime is 21101320111. The reversal of 21101320103 is 30102310112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21101320103 - 2¹⁴ = 21101303719 is a prime.

It is a super-4 number, since 4×21101320103⁴ (a number of 42 digits) contains 4444 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21101320133) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10550660051 + 10550660052.

It is an arithmetic number, because the mean of its divisors is an integer number (10550660052).

Almost surely, 2^21101320103 is an apocalyptic number.

21101320103 is a deficient number, since it is larger than the sum of its proper divisors (1).

21101320103 is an equidigital number, since it uses as much as digits as its factorization.

21101320103 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36, while the sum is 14.

Adding to 21101320103 its reverse (30102310112), we get a palindrome (51203630215).

Subtracting 21101320103 from its reverse (30102310112), we obtain a palindrome (9000990009).

The spelling of 21101320103 in words is "twenty-one billion, one hundred one million, three hundred twenty thousand, one hundred three".