3204130021 has 2 divisors, whose sum is σ = 3204130022. Its totient is φ = 3204130020.

The previous prime is 3204130019. The next prime is 3204130031. The reversal of 3204130021 is 1200314023.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1981229121 + 1222900900 = 44511^2 + 34970^2 .

It is an emirp because it is prime and its reverse (1200314023) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3204130021 - 2¹ = 3204130019 is a prime.

Together with 3204130019, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 3204129977 and 3204130004.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3204130001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1602065010 + 1602065011.

It is an arithmetic number, because the mean of its divisors is an integer number (1602065011).

Almost surely, 2^3204130021 is an apocalyptic number.

It is an amenable number.

3204130021 is a deficient number, since it is larger than the sum of its proper divisors (1).

3204130021 is an equidigital number, since it uses as much as digits as its factorization.

3204130021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 3204130021 is about 56605.0352972242. The cubic root of 3204130021 is about 1474.2462905576.

Adding to 3204130021 its reverse (1200314023), we get a palindrome (4404444044).

It can be divided in two parts, 3204 and 130021, that added together give a square (133225 = 365²).

The spelling of 3204130021 in words is "three billion, two hundred four million, one hundred thirty thousand, twenty-one".