53320221 has 16 divisors (see below), whose sum is σ = 79811200. Its totient is φ = 35178624.

The previous prime is 53320207. The next prime is 53320229. The reversal of 53320221 is 12202335.

It is not a de Polignac number, because 53320221 - 2⁹ = 53319709 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 53320194 and 53320203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (53320229) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7561 + ... + 12798.

It is an arithmetic number, because the mean of its divisors is an integer number (4988200).

Almost surely, 2^53320221 is an apocalyptic number.

It is an amenable number.

53320221 is a deficient number, since it is larger than the sum of its proper divisors (26490979).

53320221 is a wasteful number, since it uses less digits than its factorization.

53320221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20465 (or 20459 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 18.

The square root of 53320221 is about 7302.0696381232. The cubic root of 53320221 is about 376.3835610788.

Adding to 53320221 its reverse (12202335), we get a palindrome (65522556).

The spelling of 53320221 in words is "fifty-three million, three hundred twenty thousand, two hundred twenty-one".