21203112423103 has 6 divisors (see below), whose sum is σ = 22959583274904. Its totient is φ = 19572103775016.

The previous prime is 21203112423091. The next prime is 21203112423109. The reversal of 21203112423103 is 30132421130212.

It is a de Polignac number, because none of the positive numbers 2^k-21203112423103 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21203112423109) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 62731101675 + ... + 62731102012.

It is an arithmetic number, because the mean of its divisors is an integer number (3826597212484).

Almost surely, 2^{21203112423103} is an apocalyptic number.

21203112423103 is a deficient number, since it is larger than the sum of its proper divisors (1756470851801).

21203112423103 is a wasteful number, since it uses less digits than its factorization.

21203112423103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125462203713 (or 125462203700 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 25.

Adding to 21203112423103 its reverse (30132421130212), we get a palindrome (51335533553315).

The spelling of 21203112423103 in words is "twenty-one trillion, two hundred three billion, one hundred twelve million, four hundred twenty-three thousand, one hundred three".