212120111121 has 16 divisors (see below), whose sum is σ = 295135085184. Its totient is φ = 135259749504.

The previous prime is 212120111057. The next prime is 212120111171. The reversal of 212120111121 is 121111021212.

It is a happy number.

It is not a de Polignac number, because 212120111121 - 2⁶ = 212120111057 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 212120111121.

It is not an unprimeable number, because it can be changed into a prime (212120111171) 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 in 15 ways as a sum of consecutive naturals, for example, 2557515 + ... + 2639151.

It is an arithmetic number, because the mean of its divisors is an integer number (18445942824).

Almost surely, 2^212120111121 is an apocalyptic number.

It is an amenable number.

212120111121 is a deficient number, since it is larger than the sum of its proper divisors (83014974063).

212120111121 is a wasteful number, since it uses less digits than its factorization.

212120111121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 119320.

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

Adding to 212120111121 its reverse (121111021212), we get a palindrome (333231132333).

The spelling of 212120111121 in words is "two hundred twelve billion, one hundred twenty million, one hundred eleven thousand, one hundred twenty-one".