2111221321 has 4 divisors (see below), whose sum is σ = 2303150544. Its totient is φ = 1919292100.

The previous prime is 2111221297. The next prime is 2111221337. The reversal of 2111221321 is 1231221112.

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 not a de Polignac number, because 2111221321 - 2⁷ = 2111221193 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2111221295 and 2111221304.

It is not an unprimeable number, because it can be changed into a prime (2111221351) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 95964595 + ... + 95964616.

It is an arithmetic number, because the mean of its divisors is an integer number (575787636).

Almost surely, 2^2111221321 is an apocalyptic number.

It is an amenable number.

2111221321 is a deficient number, since it is larger than the sum of its proper divisors (191929223).

2111221321 is a wasteful number, since it uses less digits than its factorization.

2111221321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 191929222.

The product of its digits is 48, while the sum is 16.

The square root of 2111221321 is about 45948.0284778357. The cubic root of 2111221321 is about 1282.8560333467.

Adding to 2111221321 its reverse (1231221112), we get a palindrome (3342442433).

The spelling of 2111221321 in words is "two billion, one hundred eleven million, two hundred twenty-one thousand, three hundred twenty-one".