212012112110221 has 4 divisors (see below), whose sum is σ = 212490694756512. Its totient is φ = 211533529463932.

The previous prime is 212012112110209. The next prime is 212012112110237. The reversal of 212012112110221 is 122011211210212.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 212012112110221 - 2¹⁷ = 212012111979149 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 (212012112110321) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 239291322481 + ... + 239291323366.

It is an arithmetic number, because the mean of its divisors is an integer number (53122673689128).

Almost surely, 2^{212012112110221} is an apocalyptic number.

It is an amenable number.

212012112110221 is a deficient number, since it is larger than the sum of its proper divisors (478582646291).

212012112110221 is an equidigital number, since it uses as much as digits as its factorization.

212012112110221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 478582646290.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 212012112110221 its reverse (122011211210212), we get a palindrome (334023323320433).

Subtracting from 212012112110221 its reverse (122011211210212), we obtain a palindrome (90000900900009).

The spelling of 212012112110221 in words is "two hundred twelve trillion, twelve billion, one hundred twelve million, one hundred ten thousand, two hundred twenty-one".