2112122120221 has 4 divisors (see below), whose sum is σ = 2184953917500. Its totient is φ = 2039290322944.

The previous prime is 2112122120201. The next prime is 2112122120281. The reversal of 2112122120221 is 1220212212112.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 851698265625 + 1260423854596 = 922875^2 + 1122686^2 .

It is a cyclic number.

It is not a de Polignac number, because 2112122120221 - 2⁷ = 2112122120093 is a prime.

It is a super-2 number, since 2×2112122120221² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2112122120201) 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, 36415898596 + ... + 36415898653.

It is an arithmetic number, because the mean of its divisors is an integer number (546238479375).

Almost surely, 2^{2112122120221} is an apocalyptic number.

It is an amenable number.

2112122120221 is a deficient number, since it is larger than the sum of its proper divisors (72831797279).

2112122120221 is an equidigital number, since it uses as much as digits as its factorization.

2112122120221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72831797278.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 2112122120221 its reverse (1220212212112), we get a palindrome (3332334332333).

The spelling of 2112122120221 in words is "two trillion, one hundred twelve billion, one hundred twenty-two million, one hundred twenty thousand, two hundred twenty-one".