2321321221 has 4 divisors (see below), whose sum is σ = 2321448012. Its totient is φ = 2321194432.

The previous prime is 2321321201. The next prime is 2321321239. The reversal of 2321321221 is 1221231232.

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 1580937121 + 740384100 = 39761^2 + 27210^2 .

It is a cyclic number.

It is not a de Polignac number, because 2321321221 - 2²⁷ = 2187103493 is a prime.

It is a super-2 number, since 2×2321321221² = 10777064422129861682, which 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 (2321321201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30106 + ... + 74491.

It is an arithmetic number, because the mean of its divisors is an integer number (580362003).

Almost surely, 2^2321321221 is an apocalyptic number.

It is an amenable number.

2321321221 is a deficient number, since it is larger than the sum of its proper divisors (126791).

2321321221 is a wasteful number, since it uses less digits than its factorization.

2321321221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126790.

The product of its digits is 288, while the sum is 19.

The square root of 2321321221 is about 48180.0915420467. The cubic root of 2321321221 is about 1324.0724436908.

Adding to 2321321221 its reverse (1221231232), we get a palindrome (3542552453).

The spelling of 2321321221 in words is "two billion, three hundred twenty-one million, three hundred twenty-one thousand, two hundred twenty-one".