53239021 has 4 divisors (see below), whose sum is σ = 58078944. Its totient is φ = 48399100.

The previous prime is 53239013. The next prime is 53239037. The reversal of 53239021 is 12093235.

It is a happy number.

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 53239021 - 2³ = 53239013 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (53239001) 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, 2419945 + ... + 2419966.

It is an arithmetic number, because the mean of its divisors is an integer number (14519736).

Almost surely, 2^53239021 is an apocalyptic number.

It is an amenable number.

53239021 is a deficient number, since it is larger than the sum of its proper divisors (4839923).

53239021 is a wasteful number, since it uses less digits than its factorization.

53239021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4839922.

The product of its (nonzero) digits is 1620, while the sum is 25.

The square root of 53239021 is about 7296.5074521993. The cubic root of 53239021 is about 376.1924023781.

The spelling of 53239021 in words is "fifty-three million, two hundred thirty-nine thousand, twenty-one".