53338721 has 4 divisors (see below), whose sum is σ = 53359872. Its totient is φ = 53317572.

The previous prime is 53338711. The next prime is 53338729. The reversal of 53338721 is 12783335.

53338721 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 53338721 - 2⁶ = 53338657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (53338729) 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, 6185 + ... + 12038.

It is an arithmetic number, because the mean of its divisors is an integer number (13339968).

Almost surely, 2^53338721 is an apocalyptic number.

It is an amenable number.

53338721 is a deficient number, since it is larger than the sum of its proper divisors (21151).

53338721 is a wasteful number, since it uses less digits than its factorization.

53338721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21150.

The product of its digits is 15120, while the sum is 32.

The square root of 53338721 is about 7303.3362924077. The cubic root of 53338721 is about 376.4270860967.

The spelling of 53338721 in words is "fifty-three million, three hundred thirty-eight thousand, seven hundred twenty-one".