21211222103 has 2 divisors, whose sum is σ = 21211222104. Its totient is φ = 21211222102.

The previous prime is 21211222091. The next prime is 21211222117. The reversal of 21211222103 is 30122211212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21211222103 - 2²⁰ = 21210173527 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21211222183) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10605611051 + 10605611052.

It is an arithmetic number, because the mean of its divisors is an integer number (10605611052).

Almost surely, 2^21211222103 is an apocalyptic number.

21211222103 is a deficient number, since it is larger than the sum of its proper divisors (1).

21211222103 is an equidigital number, since it uses as much as digits as its factorization.

21211222103 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 21211222103 its reverse (30122211212), we get a palindrome (51333433315).

The spelling of 21211222103 in words is "twenty-one billion, two hundred eleven million, two hundred twenty-two thousand, one hundred three".