39033221 has 4 divisors (see below), whose sum is σ = 39057312. Its totient is φ = 39009132.

The previous prime is 39033209. The next prime is 39033223. The reversal of 39033221 is 12233093.

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: 12233093 = 19 ⋅643847.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-39033221 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 (39033223) 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, 9425 + ... + 12918.

It is an arithmetic number, because the mean of its divisors is an integer number (9764328).

Almost surely, 2^39033221 is an apocalyptic number.

It is an amenable number.

39033221 is a deficient number, since it is larger than the sum of its proper divisors (24091).

39033221 is a wasteful number, since it uses less digits than its factorization.

39033221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24090.

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

The square root of 39033221 is about 6247.6572409184. The cubic root of 39033221 is about 339.2174070894.

The spelling of 39033221 in words is "thirty-nine million, thirty-three thousand, two hundred twenty-one".