212110121 has 2 divisors, whose sum is σ = 212110122. Its totient is φ = 212110120.

The previous prime is 212110111. The next prime is 212110123. The reversal of 212110121 is 121011212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 212110096 + 25 = 14564^2 + 5^2 .

It is a cyclic number.

It is not a de Polignac number, because 212110121 - 2²² = 207915817 is a prime.

Together with 212110123, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (212110123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106055060 + 106055061.

It is an arithmetic number, because the mean of its divisors is an integer number (106055061).

Almost surely, 2^212110121 is an apocalyptic number.

It is an amenable number.

212110121 is a deficient number, since it is larger than the sum of its proper divisors (1).

212110121 is an equidigital number, since it uses as much as digits as its factorization.

212110121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8, while the sum is 11.

The square root of 212110121 is about 14564.0008582807. Note that the first 3 decimals coincide. The cubic root of 212110121 is about 596.3764203572.

Adding to 212110121 its reverse (121011212), we get a palindrome (333121333).

The spelling of 212110121 in words is "two hundred twelve million, one hundred ten thousand, one hundred twenty-one".