212121111107 has 2 divisors, whose sum is σ = 212121111108. Its totient is φ = 212121111106.

The previous prime is 212121111079. The next prime is 212121111151. The reversal of 212121111107 is 701111121212.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 212121111107 - 2¹⁰ = 212121110083 is a prime.

It is not a weakly prime, because it can be changed into another prime (212121111607) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106060555553 + 106060555554.

It is an arithmetic number, because the mean of its divisors is an integer number (106060555554).

Almost surely, 2^212121111107 is an apocalyptic number.

212121111107 is a deficient number, since it is larger than the sum of its proper divisors (1).

212121111107 is an equidigital number, since it uses as much as digits as its factorization.

212121111107 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 56, while the sum is 20.

Adding to 212121111107 its reverse (701111121212), we get a palindrome (913232232319).

The spelling of 212121111107 in words is "two hundred twelve billion, one hundred twenty-one million, one hundred eleven thousand, one hundred seven".