21121012103 has 2 divisors, whose sum is σ = 21121012104. Its totient is φ = 21121012102.

The previous prime is 21121012049. The next prime is 21121012189. The reversal of 21121012103 is 30121012112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21121012103 - 2²⁴ = 21104234887 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21121012403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10560506051 + 10560506052.

It is an arithmetic number, because the mean of its divisors is an integer number (10560506052).

Almost surely, 2^21121012103 is an apocalyptic number.

21121012103 is a deficient number, since it is larger than the sum of its proper divisors (1).

21121012103 is an equidigital number, since it uses as much as digits as its factorization.

21121012103 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24, while the sum is 14.

Adding to 21121012103 its reverse (30121012112), we get a palindrome (51242024215).

Subtracting 21121012103 from its reverse (30121012112), we obtain a palindrome (9000000009).

The spelling of 21121012103 in words is "twenty-one billion, one hundred twenty-one million, twelve thousand, one hundred three".