53221660 has 24 divisors (see below), whose sum is σ = 117648720. Its totient is φ = 20168064.

The previous prime is 53221639. The next prime is 53221673. The reversal of 53221660 is 6612235.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 69649 + ... + 70408.

It is an arithmetic number, because the mean of its divisors is an integer number (4902030).

Almost surely, 2^53221660 is an apocalyptic number.

It is an amenable number.

53221660 is an abundant number, since it is smaller than the sum of its proper divisors (64427060).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

53221660 is a wasteful number, since it uses less digits than its factorization.

53221660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140085 (or 140083 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 25.

The square root of 53221660 is about 7295.3176764278. The cubic root of 53221660 is about 376.1515063948.

Adding to 53221660 its reverse (6612235), we get a palindrome (59833895).

The spelling of 53221660 in words is "fifty-three million, two hundred twenty-one thousand, six hundred sixty".