212121113 has 2 divisors, whose sum is σ = 212121114. Its totient is φ = 212121112.

The previous prime is 212121067. The next prime is 212121139. The reversal of 212121113 is 311121212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 138109504 + 74011609 = 11752^2 + 8603^2 .

It is a cyclic number.

It is not a de Polignac number, because 212121113 - 2¹⁶ = 212055577 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (212121163) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106060556 + 106060557.

It is an arithmetic number, because the mean of its divisors is an integer number (106060557).

Almost surely, 2^212121113 is an apocalyptic number.

It is an amenable number.

212121113 is a deficient number, since it is larger than the sum of its proper divisors (1).

212121113 is an equidigital number, since it uses as much as digits as its factorization.

212121113 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 24, while the sum is 14.

The square root of 212121113 is about 14564.3782222242. The cubic root of 212121113 is about 596.3867220131.

Adding to 212121113 its reverse (311121212), we get a palindrome (523242325).

Subtracting 212121113 from its reverse (311121212), we obtain a palindrome (99000099).

The spelling of 212121113 in words is "two hundred twelve million, one hundred twenty-one thousand, one hundred thirteen".