39021 has 4 divisors (see below), whose sum is σ = 52032. Its totient is φ = 26012.

The previous prime is 39019. The next prime is 39023. The reversal of 39021 is 12093.

39021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (39019) and next prime (39023).

It is a cyclic number.

It is not a de Polignac number, because 39021 - 2¹ = 39019 is a prime.

It is a D-number.

It is a nialpdrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39023) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6501 + ... + 6506.

It is an arithmetic number, because the mean of its divisors is an integer number (13008).

2³⁹⁰²¹ is an apocalyptic number.

It is an amenable number.

39021 is a deficient number, since it is larger than the sum of its proper divisors (13011).

39021 is a wasteful number, since it uses less digits than its factorization.

39021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13010.

The product of its (nonzero) digits is 54, while the sum is 15.

The square root of 39021 is about 197.5373382427. The cubic root of 39021 is about 33.9182001277.

The spelling of 39021 in words is "thirty-nine thousand, twenty-one".