21022222103 has 4 divisors (see below), whose sum is σ = 21335986680. Its totient is φ = 20708457528.

The previous prime is 21022222033. The next prime is 21022222129. The reversal of 21022222103 is 30122222012.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21022222103 - 2¹⁰ = 21022221079 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21022222303) 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 in 3 ways as a sum of consecutive naturals, for example, 156882188 + ... + 156882321.

It is an arithmetic number, because the mean of its divisors is an integer number (5333996670).

Almost surely, 2^21022222103 is an apocalyptic number.

21022222103 is a deficient number, since it is larger than the sum of its proper divisors (313764577).

21022222103 is an equidigital number, since it uses as much as digits as its factorization.

21022222103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 313764576.

The product of its (nonzero) digits is 192, while the sum is 17.

Adding to 21022222103 its reverse (30122222012), we get a palindrome (51144444115).

Subtracting 21022222103 from its reverse (30122222012), we obtain a palindrome (9099999909).

The spelling of 21022222103 in words is "twenty-one billion, twenty-two million, two hundred twenty-two thousand, one hundred three".