21303203140123 has 2 divisors, whose sum is σ = 21303203140124. Its totient is φ = 21303203140122.

The previous prime is 21303203140103. The next prime is 21303203140129. The reversal of 21303203140123 is 32104130230312.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21303203140123 - 2⁵ = 21303203140091 is a prime.

It is not a weakly prime, because it can be changed into another prime (21303203140129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10651601570061 + 10651601570062.

It is an arithmetic number, because the mean of its divisors is an integer number (10651601570062).

Almost surely, 2^{21303203140123} is an apocalyptic number.

21303203140123 is a deficient number, since it is larger than the sum of its proper divisors (1).

21303203140123 is an equidigital number, since it uses as much as digits as its factorization.

21303203140123 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2592, while the sum is 25.

Adding to 21303203140123 its reverse (32104130230312), we get a palindrome (53407333370435).

The spelling of 21303203140123 in words is "twenty-one trillion, three hundred three billion, two hundred three million, one hundred forty thousand, one hundred twenty-three".