212120101111121 has 24 divisors (see below), whose sum is σ = 248704347156480. Its totient is φ = 180378733272192.

The previous prime is 212120101111103. The next prime is 212120101111337. The reversal of 212120101111121 is 121111101021212.

It is not a de Polignac number, because 212120101111121 - 2²⁶ = 212120034002257 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 212120101111121.

It is not an unprimeable number, because it can be changed into a prime (212120101111921) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 166346600 + ... + 167616918.

It is an arithmetic number, because the mean of its divisors is an integer number (10362681131520).

Almost surely, 2^{212120101111121} is an apocalyptic number.

It is an amenable number.

212120101111121 is a deficient number, since it is larger than the sum of its proper divisors (36584246045359).

212120101111121 is a wasteful number, since it uses less digits than its factorization.

212120101111121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1297293 (or 1297286 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 17.

Adding to 212120101111121 its reverse (121111101021212), we get a palindrome (333231202132333).

The spelling of 212120101111121 in words is "two hundred twelve trillion, one hundred twenty billion, one hundred one million, one hundred eleven thousand, one hundred twenty-one".