212112122011221 has 16 divisors (see below), whose sum is σ = 295219481172480. Its totient is φ = 135308928860160.

The previous prime is 212112122011201. The next prime is 212112122011247. The reversal of 212112122011221 is 122110221211212.

It is not a de Polignac number, because 212112122011221 - 2⁹ = 212112122010709 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212112122011201) 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, 12813337260 + ... + 12813353813.

It is an arithmetic number, because the mean of its divisors is an integer number (18451217573280).

Almost surely, 2^{212112122011221} is an apocalyptic number.

It is an amenable number.

212112122011221 is a deficient number, since it is larger than the sum of its proper divisors (83107359161259).

212112122011221 is a wasteful number, since it uses less digits than its factorization.

212112122011221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25626691196.

The product of its (nonzero) digits is 128, while the sum is 21.

Adding to 212112122011221 its reverse (122110221211212), we get a palindrome (334222343222433).

The spelling of 212112122011221 in words is "two hundred twelve trillion, one hundred twelve billion, one hundred twenty-two million, eleven thousand, two hundred twenty-one".