21211210103 has 2 divisors, whose sum is σ = 21211210104. Its totient is φ = 21211210102.

The previous prime is 21211210079. The next prime is 21211210109. The reversal of 21211210103 is 30101211212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21211210103 - 2⁸ = 21211209847 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21211210109) 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, 10605605051 + 10605605052.

It is an arithmetic number, because the mean of its divisors is an integer number (10605605052).

Almost surely, 2^21211210103 is an apocalyptic number.

21211210103 is a deficient number, since it is larger than the sum of its proper divisors (1).

21211210103 is an equidigital number, since it uses as much as digits as its factorization.

21211210103 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 21211210103 its reverse (30101211212), we get a palindrome (51312421315).

The spelling of 21211210103 in words is "twenty-one billion, two hundred eleven million, two hundred ten thousand, one hundred three".