21210100011103 has 2 divisors, whose sum is σ = 21210100011104. Its totient is φ = 21210100011102.

The previous prime is 21210100011077. The next prime is 21210100011157. The reversal of 21210100011103 is 30111000101212.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21210100011103 - 2⁵ = 21210100011071 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21210100015103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10605050005551 + 10605050005552.

It is an arithmetic number, because the mean of its divisors is an integer number (10605050005552).

Almost surely, 2^{21210100011103} is an apocalyptic number.

21210100011103 is a deficient number, since it is larger than the sum of its proper divisors (1).

21210100011103 is an equidigital number, since it uses as much as digits as its factorization.

21210100011103 is an evil number, because the sum of its binary digits is even.

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

Adding to 21210100011103 its reverse (30111000101212), we get a palindrome (51321100112315).

The spelling of 21210100011103 in words is "twenty-one trillion, two hundred ten billion, one hundred million, eleven thousand, one hundred three".