53239221 has 32 divisors (see below), whose sum is σ = 91065600. Its totient is φ = 30110400.

The previous prime is 53239217. The next prime is 53239229. The reversal of 53239221 is 12293235.

It is not a de Polignac number, because 53239221 - 2² = 53239217 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (53239229) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 17695 + ... + 20483.

It is an arithmetic number, because the mean of its divisors is an integer number (2845800).

Almost surely, 2^53239221 is an apocalyptic number.

It is an amenable number.

53239221 is a deficient number, since it is larger than the sum of its proper divisors (37826379).

53239221 is a wasteful number, since it uses less digits than its factorization.

53239221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2906 (or 2900 counting only the distinct ones).

The product of its digits is 3240, while the sum is 27.

The square root of 53239221 is about 7296.5211573736. The cubic root of 53239221 is about 376.1928734510.

The spelling of 53239221 in words is "fifty-three million, two hundred thirty-nine thousand, two hundred twenty-one".