4323021221 has 2 divisors, whose sum is σ = 4323021222. Its totient is φ = 4323021220.

The previous prime is 4323021217. The next prime is 4323021251. The reversal of 4323021221 is 1221203234.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2196796900 + 2126224321 = 46870^2 + 46111^2 .

It is a cyclic number.

It is not a de Polignac number, because 4323021221 - 2² = 4323021217 is a prime.

It is a super-4 number, since 4×4323021221⁴ (a number of 40 digits) contains 4444 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 4323021193 and 4323021202.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4323021251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2161510610 + 2161510611.

It is an arithmetic number, because the mean of its divisors is an integer number (2161510611).

Almost surely, 2^4323021221 is an apocalyptic number.

It is an amenable number.

4323021221 is a deficient number, since it is larger than the sum of its proper divisors (1).

4323021221 is an equidigital number, since it uses as much as digits as its factorization.

4323021221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 4323021221 is about 65749.6860905054. The cubic root of 4323021221 is about 1629.0301507196.

Adding to 4323021221 its reverse (1221203234), we get a palindrome (5544224455).

The spelling of 4323021221 in words is "four billion, three hundred twenty-three million, twenty-one thousand, two hundred twenty-one".