2112421321 has 4 divisors (see below), whose sum is σ = 2117852100. Its totient is φ = 2106990544.

The previous prime is 2112421291. The next prime is 2112421327. The reversal of 2112421321 is 1231242112.

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 298598400 + 1813822921 = 17280^2 + 42589^2 .

It is a cyclic number.

It is not a de Polignac number, because 2112421321 - 2¹¹ = 2112419273 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2112421327) 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, 2714806 + ... + 2715583.

It is an arithmetic number, because the mean of its divisors is an integer number (529463025).

Almost surely, 2^2112421321 is an apocalyptic number.

It is an amenable number.

2112421321 is a deficient number, since it is larger than the sum of its proper divisors (5430779).

2112421321 is an equidigital number, since it uses as much as digits as its factorization.

2112421321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5430778.

The product of its digits is 192, while the sum is 19.

The square root of 2112421321 is about 45961.0848544723. The cubic root of 2112421321 is about 1283.0990420815.

Adding to 2112421321 its reverse (1231242112), we get a palindrome (3343663433).

The spelling of 2112421321 in words is "two billion, one hundred twelve million, four hundred twenty-one thousand, three hundred twenty-one".