3238840021 has 2 divisors, whose sum is σ = 3238840022. Its totient is φ = 3238840020.

The previous prime is 3238840019. The next prime is 3238840039. The reversal of 3238840021 is 1200488323.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2071251121 + 1167588900 = 45511^2 + 34170^2 .

It is a cyclic number.

It is not a de Polignac number, because 3238840021 - 2¹ = 3238840019 is a prime.

Together with 3238840019, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3238840091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1619420010 + 1619420011.

It is an arithmetic number, because the mean of its divisors is an integer number (1619420011).

Almost surely, 2^3238840021 is an apocalyptic number.

It is an amenable number.

3238840021 is a deficient number, since it is larger than the sum of its proper divisors (1).

3238840021 is an equidigital number, since it uses as much as digits as its factorization.

3238840021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9216, while the sum is 31.

The square root of 3238840021 is about 56910.8075939887. The cubic root of 3238840021 is about 1479.5506337536.

The spelling of 3238840021 in words is "three billion, two hundred thirty-eight million, eight hundred forty thousand, twenty-one".