21001110210103 has 2 divisors, whose sum is σ = 21001110210104. Its totient is φ = 21001110210102.

The previous prime is 21001110210097. The next prime is 21001110210161. The reversal of 21001110210103 is 30101201110012.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21001110210103 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21001110210203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10500555105051 + 10500555105052.

It is an arithmetic number, because the mean of its divisors is an integer number (10500555105052).

Almost surely, 2^{21001110210103} is an apocalyptic number.

21001110210103 is a deficient number, since it is larger than the sum of its proper divisors (1).

21001110210103 is an equidigital number, since it uses as much as digits as its factorization.

21001110210103 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12, while the sum is 13.

Adding to 21001110210103 its reverse (30101201110012), we get a palindrome (51102311320115).

The spelling of 21001110210103 in words is "twenty-one trillion, one billion, one hundred ten million, two hundred ten thousand, one hundred three".