2121112230221 has 4 divisors (see below), whose sum is σ = 2121194895552. Its totient is φ = 2121029564892.

The previous prime is 2121112230161. The next prime is 2121112230317. The reversal of 2121112230221 is 1220322111212.

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 2121112230221 - 2¹⁴ = 2121112213837 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2121112230193 and 2121112230202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121112220221) 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, 41294165 + ... + 41345498.

It is an arithmetic number, because the mean of its divisors is an integer number (530298723888).

Almost surely, 2^{2121112230221} is an apocalyptic number.

It is an amenable number.

2121112230221 is a deficient number, since it is larger than the sum of its proper divisors (82665331).

2121112230221 is an equidigital number, since it uses as much as digits as its factorization.

2121112230221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82665330.

The product of its (nonzero) digits is 192, while the sum is 20.

Adding to 2121112230221 its reverse (1220322111212), we get a palindrome (3341434341433).

The spelling of 2121112230221 in words is "two trillion, one hundred twenty-one billion, one hundred twelve million, two hundred thirty thousand, two hundred twenty-one".