53404221 has 8 divisors (see below), whose sum is σ = 76683040. Its totient is φ = 32864112.

The previous prime is 53404207. The next prime is 53404261. The reversal of 53404221 is 12240435.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 53404221 - 2⁹ = 53403709 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (53404201) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 684631 + ... + 684708.

It is an arithmetic number, because the mean of its divisors is an integer number (9585380).

Almost surely, 2^53404221 is an apocalyptic number.

It is an amenable number.

53404221 is a deficient number, since it is larger than the sum of its proper divisors (23278819).

53404221 is a wasteful number, since it uses less digits than its factorization.

53404221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1369355.

The product of its (nonzero) digits is 960, while the sum is 21.

The square root of 53404221 is about 7307.8191685345. The cubic root of 53404221 is about 376.5811073408.

Adding to 53404221 its reverse (12240435), we get a palindrome (65644656).

The spelling of 53404221 in words is "fifty-three million, four hundred four thousand, two hundred twenty-one".