53221218 has 16 divisors (see below), whose sum is σ = 111070656. Its totient is φ = 16969040.

The previous prime is 53221187. The next prime is 53221253. The reversal of 53221218 is 81212235.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 192693 + ... + 192968.

It is an arithmetic number, because the mean of its divisors is an integer number (6941916).

Almost surely, 2^53221218 is an apocalyptic number.

53221218 is an abundant number, since it is smaller than the sum of its proper divisors (57849438).

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

53221218 is a wasteful number, since it uses less digits than its factorization.

53221218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 385689.

The product of its digits is 960, while the sum is 24.

The square root of 53221218 is about 7295.2873829617. The cubic root of 53221218 is about 376.1504650930.

It can be divided in two parts, 5 and 3221218, that added together give a palindrome (3221223).

The spelling of 53221218 in words is "fifty-three million, two hundred twenty-one thousand, two hundred eighteen".