21123013103 has 2 divisors, whose sum is σ = 21123013104. Its totient is φ = 21123013102.

The previous prime is 21123013073. The next prime is 21123013141. The reversal of 21123013103 is 30131032112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21123013103 - 2¹⁶ = 21122947567 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21123013183) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10561506551 + 10561506552.

It is an arithmetic number, because the mean of its divisors is an integer number (10561506552).

Almost surely, 2^21123013103 is an apocalyptic number.

21123013103 is a deficient number, since it is larger than the sum of its proper divisors (1).

21123013103 is an equidigital number, since it uses as much as digits as its factorization.

21123013103 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 21123013103 its reverse (30131032112), we get a palindrome (51254045215).

The spelling of 21123013103 in words is "twenty-one billion, one hundred twenty-three million, thirteen thousand, one hundred three".