212011112121 has 16 divisors (see below), whose sum is σ = 283331131200. Its totient is φ = 141016187648.

The previous prime is 212011112107. The next prime is 212011112129. The reversal of 212011112121 is 121211110212.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 212011112121 - 2¹⁰ = 212011111097 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 212011112121.

It is not an unprimeable number, because it can be changed into a prime (212011112129) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3222685 + ... + 3287813.

It is an arithmetic number, because the mean of its divisors is an integer number (17708195700).

Almost surely, 2^212011112121 is an apocalyptic number.

It is an amenable number.

212011112121 is a deficient number, since it is larger than the sum of its proper divisors (71320019079).

212011112121 is a wasteful number, since it uses less digits than its factorization.

212011112121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67608.

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

Adding to 212011112121 its reverse (121211110212), we get a palindrome (333222222333).

The spelling of 212011112121 in words is "two hundred twelve billion, eleven million, one hundred twelve thousand, one hundred twenty-one".