21212123211103 has 8 divisors (see below), whose sum is σ = 23632849071360. Its totient is φ = 18873455854680.

The previous prime is 21212123211101. The next prime is 21212123211119. The reversal of 21212123211103 is 30111232121212.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21212123211103 - 2¹ = 21212123211101 is a prime.

It is a super-3 number, since 3×21212123211103³ (a number of 41 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21212123211101) 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 7 ways as a sum of consecutive naturals, for example, 20514625413 + ... + 20514626446.

It is an arithmetic number, because the mean of its divisors is an integer number (2954106133920).

Almost surely, 2^{21212123211103} is an apocalyptic number.

21212123211103 is a deficient number, since it is larger than the sum of its proper divisors (2420725860257).

21212123211103 is a wasteful number, since it uses less digits than its factorization.

21212123211103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41029251917.

The product of its (nonzero) digits is 288, while the sum is 22.

Adding to 21212123211103 its reverse (30111232121212), we get a palindrome (51323355332315).

The spelling of 21212123211103 in words is "twenty-one trillion, two hundred twelve billion, one hundred twenty-three million, two hundred eleven thousand, one hundred three".