39221921 has 4 divisors (see below), whose sum is σ = 39288000. Its totient is φ = 39155844.

The previous prime is 39221893. The next prime is 39221927. The reversal of 39221921 is 12912293.

39221921 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 a cyclic number.

It is not a de Polignac number, because 39221921 - 2⁶ = 39221857 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (39221927) 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, 32141 + ... + 33338.

It is an arithmetic number, because the mean of its divisors is an integer number (9822000).

Almost surely, 2^39221921 is an apocalyptic number.

It is an amenable number.

39221921 is a deficient number, since it is larger than the sum of its proper divisors (66079).

39221921 is an equidigital number, since it uses as much as digits as its factorization.

39221921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66078.

The product of its digits is 1944, while the sum is 29.

The square root of 39221921 is about 6262.7406939774. The cubic root of 39221921 is about 339.7631597408.

The spelling of 39221921 in words is "thirty-nine million, two hundred twenty-one thousand, nine hundred twenty-one".