21112103 has 2 divisors, whose sum is σ = 21112104. Its totient is φ = 21112102.

The previous prime is 21112093. The next prime is 21112121. The reversal of 21112103 is 30121112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21112103 - 2¹² = 21108007 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21112193) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10556051 + 10556052.

It is an arithmetic number, because the mean of its divisors is an integer number (10556052).

Almost surely, 2^21112103 is an apocalyptic number.

21112103 is a deficient number, since it is larger than the sum of its proper divisors (1).

21112103 is an equidigital number, since it uses as much as digits as its factorization.

21112103 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 11.

The square root of 21112103 is about 4594.7908548703. The cubic root of 21112103 is about 276.3824731302.

Adding to 21112103 its reverse (30121112), we get a palindrome (51233215).

Subtracting 21112103 from its reverse (30121112), we obtain a palindrome (9009009).

The spelling of 21112103 in words is "twenty-one million, one hundred twelve thousand, one hundred three".