21032339 has 2 divisors, whose sum is σ = 21032340. Its totient is φ = 21032338.

The previous prime is 21032329. The next prime is 21032357. The reversal of 21032339 is 93323012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21032339 - 2⁸ = 21032083 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (21032309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10516169 + 10516170.

It is an arithmetic number, because the mean of its divisors is an integer number (10516170).

Almost surely, 2^21032339 is an apocalyptic number.

21032339 is a deficient number, since it is larger than the sum of its proper divisors (1).

21032339 is an equidigital number, since it uses as much as digits as its factorization.

21032339 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 972, while the sum is 23.

The square root of 21032339 is about 4586.1028117564. The cubic root of 21032339 is about 276.0339653992.

The spelling of 21032339 in words is "twenty-one million, thirty-two thousand, three hundred thirty-nine".