212121100120103 has 16 divisors (see below), whose sum is σ = 227095017520896. Its totient is φ = 197641847156160.

The previous prime is 212121100120093. The next prime is 212121100120133. The reversal of 212121100120103 is 301021001121212.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 212121100120103 - 2²⁰ = 212121099071527 is a prime.

It is a super-3 number, since 3×212121100120103³ (a number of 44 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212121100120133) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 174310325 + ... + 175523022.

It is an arithmetic number, because the mean of its divisors is an integer number (14193438595056).

Almost surely, 2^{212121100120103} is an apocalyptic number.

212121100120103 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

212121100120103 is a deficient number, since it is larger than the sum of its proper divisors (14973917400793).

212121100120103 is a wasteful number, since it uses less digits than its factorization.

212121100120103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 349834054.

The product of its (nonzero) digits is 48, while the sum is 17.

Adding to 212121100120103 its reverse (301021001121212), we get a palindrome (513142101241315).

The spelling of 212121100120103 in words is "two hundred twelve trillion, one hundred twenty-one billion, one hundred million, one hundred twenty thousand, one hundred three".