212121103 has 8 divisors (see below), whose sum is σ = 213677568. Its totient is φ = 210570624.

The previous prime is 212121067. The next prime is 212121113. The reversal of 212121103 is 301121212.

212121103 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 212121103 - 2¹³ = 212112911 is a prime.

It is a super-3 number, since 3×212121103³ (a number of 26 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212121113) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 88051 + ... + 90427.

It is an arithmetic number, because the mean of its divisors is an integer number (26709696).

Almost surely, 2^212121103 is an apocalyptic number.

212121103 is a deficient number, since it is larger than the sum of its proper divisors (1556465).

212121103 is a wasteful number, since it uses less digits than its factorization.

212121103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2993.

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 212121103 is about 14564.3778789209. The cubic root of 212121103 is about 596.3867126413.

Adding to 212121103 its reverse (301121212), we get a palindrome (513242315).

The spelling of 212121103 in words is "two hundred twelve million, one hundred twenty-one thousand, one hundred three".