21212221100103 has 24 divisors (see below), whose sum is σ = 33427200493440. Its totient is φ = 12855167577360.

The previous prime is 21212221100023. The next prime is 21212221100113. The reversal of 21212221100103 is 30100112221212.

It is not a de Polignac number, because 21212221100103 - 2¹⁶ = 21212221034567 is a prime.

It is a super-2 number, since 2×21212221100103² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21212221100113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4263913 + ... + 7784946.

It is an arithmetic number, because the mean of its divisors is an integer number (1392800020560).

Almost surely, 2^{21212221100103} is an apocalyptic number.

21212221100103 is a deficient number, since it is larger than the sum of its proper divisors (12214979393337).

21212221100103 is a wasteful number, since it uses less digits than its factorization.

21212221100103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12066659 (or 12066656 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

Adding to 21212221100103 its reverse (30100112221212), we get a palindrome (51312333321315).

The spelling of 21212221100103 in words is "twenty-one trillion, two hundred twelve billion, two hundred twenty-one million, one hundred thousand, one hundred three".