212111102121 has 8 divisors (see below), whose sum is σ = 285730419744. Its totient is φ = 139949592960.

The previous prime is 212111102117. The next prime is 212111102129. The reversal of 212111102121 is 121201111212.

It is a happy number.

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

It is not a de Polignac number, because 212111102121 - 2² = 212111102117 is a prime.

It is a super-2 number, since 2×212111102121² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 212111102121.

It is not an unprimeable number, because it can be changed into a prime (212111102129) 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 7 ways as a sum of consecutive naturals, for example, 364451775 + ... + 364452356.

It is an arithmetic number, because the mean of its divisors is an integer number (35716302468).

Almost surely, 2^212111102121 is an apocalyptic number.

It is an amenable number.

212111102121 is a deficient number, since it is larger than the sum of its proper divisors (73619317623).

212111102121 is an equidigital number, since it uses as much as digits as its factorization.

212111102121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 728904231.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 212111102121 its reverse (121201111212), we get a palindrome (333312213333).

Subtracting from 212111102121 its reverse (121201111212), we obtain a palindrome (90909990909).

The spelling of 212111102121 in words is "two hundred twelve billion, one hundred eleven million, one hundred two thousand, one hundred twenty-one".