2321121221 has 4 divisors (see below), whose sum is σ = 2321389152. Its totient is φ = 2320853292.

The previous prime is 2321121161. The next prime is 2321121239. The reversal of 2321121221 is 1221211232.

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 2321121221 - 2¹⁴ = 2321104837 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2321121221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2321121821) 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, 120521 + ... + 138446.

It is an arithmetic number, because the mean of its divisors is an integer number (580347288).

Almost surely, 2^2321121221 is an apocalyptic number.

It is an amenable number.

2321121221 is a deficient number, since it is larger than the sum of its proper divisors (267931).

2321121221 is an equidigital number, since it uses as much as digits as its factorization.

2321121221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 267930.

The product of its digits is 96, while the sum is 17.

The square root of 2321121221 is about 48178.0159512614. The cubic root of 2321121221 is about 1324.0344161957.

Adding to 2321121221 its reverse (1221211232), we get a palindrome (3542332453).

The spelling of 2321121221 in words is "two billion, three hundred twenty-one million, one hundred twenty-one thousand, two hundred twenty-one".