21032329 has 2 divisors, whose sum is σ = 21032330. Its totient is φ = 21032328.

The previous prime is 21032309. The next prime is 21032339. The reversal of 21032329 is 92323012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17139600 + 3892729 = 4140^2 + 1973^2 .

It is a cyclic number.

It is not a de Polignac number, because 21032329 - 2⁷ = 21032201 is a prime.

It is an alternating number because its digits alternate between even and odd.

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

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10516164 + 10516165.

It is an arithmetic number, because the mean of its divisors is an integer number (10516165).

Almost surely, 2^21032329 is an apocalyptic number.

It is an amenable number.

21032329 is a deficient number, since it is larger than the sum of its proper divisors (1).

21032329 is an equidigital number, since it uses as much as digits as its factorization.

21032329 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 648, while the sum is 22.

The square root of 21032329 is about 4586.1017215060. The cubic root of 21032329 is about 276.0339216516.

The spelling of 21032329 in words is "twenty-one million, thirty-two thousand, three hundred twenty-nine".