21105122303 has 2 divisors, whose sum is σ = 21105122304. Its totient is φ = 21105122302.

The previous prime is 21105122287. The next prime is 21105122323. The reversal of 21105122303 is 30322150112.

It is an a-pointer prime, because the next prime (21105122323) can be obtained adding 21105122303 to its sum of digits (20).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21105122303 - 2⁴ = 21105122287 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21105122323) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10552561151 + 10552561152.

It is an arithmetic number, because the mean of its divisors is an integer number (10552561152).

Almost surely, 2^21105122303 is an apocalyptic number.

21105122303 is a deficient number, since it is larger than the sum of its proper divisors (1).

21105122303 is an equidigital number, since it uses as much as digits as its factorization.

21105122303 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 360, while the sum is 20.

Adding to 21105122303 its reverse (30322150112), we get a palindrome (51427272415).

The spelling of 21105122303 in words is "twenty-one billion, one hundred five million, one hundred twenty-two thousand, three hundred three".