39015021 has 4 divisors (see below), whose sum is σ = 52020032. Its totient is φ = 26010012.

The previous prime is 39015007. The next prime is 39015071. The reversal of 39015021 is 12051093.

39015021 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, and also an emirpimes, since its reverse is a distinct semiprime: 12051093 = 3 ⋅4017031.

It is not a de Polignac number, because 39015021 - 2⁷ = 39014893 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39015071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6502501 + ... + 6502506.

It is an arithmetic number, because the mean of its divisors is an integer number (13005008).

Almost surely, 2^39015021 is an apocalyptic number.

It is an amenable number.

39015021 is a deficient number, since it is larger than the sum of its proper divisors (13005011).

39015021 is a wasteful number, since it uses less digits than its factorization.

39015021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13005010.

The product of its (nonzero) digits is 270, while the sum is 21.

The square root of 39015021 is about 6246.2005251193. The cubic root of 39015021 is about 339.1646766507.

The spelling of 39015021 in words is "thirty-nine million, fifteen thousand, twenty-one".