39331021 has 2 divisors, whose sum is σ = 39331022. Its totient is φ = 39331020.

The previous prime is 39331009. The next prime is 39331027. The reversal of 39331021 is 12013393.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27185796 + 12145225 = 5214^2 + 3485^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-39331021 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 39330983 and 39331001.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (39331027) 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, 19665510 + 19665511.

It is an arithmetic number, because the mean of its divisors is an integer number (19665511).

Almost surely, 2^39331021 is an apocalyptic number.

It is an amenable number.

39331021 is a deficient number, since it is larger than the sum of its proper divisors (1).

39331021 is an equidigital number, since it uses as much as digits as its factorization.

39331021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 486, while the sum is 22.

The square root of 39331021 is about 6271.4448893377. Note that the first 3 decimals coincide. The cubic root of 39331021 is about 340.0778973765.

The spelling of 39331021 in words is "thirty-nine million, three hundred thirty-one thousand, twenty-one".