212121122001111 has 8 divisors (see below), whose sum is σ = 314253514075760. Its totient is φ = 141414081334056.

The previous prime is 212121122001091. The next prime is 212121122001253. The reversal of 212121122001111 is 111100221121212.

It is a happy number.

212121122001111 is a `hidden beast` number, since 2 + 121 + 211 + 220 + 0 + 1 + 111 = 666.

It is not a de Polignac number, because 212121122001111 - 2¹¹ = 212121121999063 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212121122001911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3928168925920 + ... + 3928168925973.

It is an arithmetic number, because the mean of its divisors is an integer number (39281689259470).

Almost surely, 2^{212121122001111} is an apocalyptic number.

212121122001111 is a deficient number, since it is larger than the sum of its proper divisors (102132392074649).

212121122001111 is an equidigital number, since it uses as much as digits as its factorization.

212121122001111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7856337851902 (or 7856337851896 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 18.

Adding to 212121122001111 its reverse (111100221121212), we get a palindrome (323221343122323).

The spelling of 212121122001111 in words is "two hundred twelve trillion, one hundred twenty-one billion, one hundred twenty-two million, one thousand, one hundred eleven".