21020210203103 has 2 divisors, whose sum is σ = 21020210203104. Its totient is φ = 21020210203102.

The previous prime is 21020210203087. The next prime is 21020210203117. The reversal of 21020210203103 is 30130201202012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21020210203103 - 2⁴ = 21020210203087 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21020210206103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10510105101551 + 10510105101552.

It is an arithmetic number, because the mean of its divisors is an integer number (10510105101552).

Almost surely, 2^{21020210203103} is an apocalyptic number.

21020210203103 is a deficient number, since it is larger than the sum of its proper divisors (1).

21020210203103 is an equidigital number, since it uses as much as digits as its factorization.

21020210203103 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 21020210203103 its reverse (30130201202012), we get a palindrome (51150411405115).

The spelling of 21020210203103 in words is "twenty-one trillion, twenty billion, two hundred ten million, two hundred three thousand, one hundred three".