53405421 has 8 divisors (see below), whose sum is σ = 71391840. Its totient is φ = 35511312.

The previous prime is 53405399. The next prime is 53405459. The reversal of 53405421 is 12450435.

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

It is not a de Polignac number, because 53405421 - 2⁶ = 53405357 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 53405391 and 53405400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (53405491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21715 + ... + 24048.

It is an arithmetic number, because the mean of its divisors is an integer number (8923980).

Almost surely, 2^53405421 is an apocalyptic number.

It is an amenable number.

53405421 is a deficient number, since it is larger than the sum of its proper divisors (17986419).

53405421 is a wasteful number, since it uses less digits than its factorization.

53405421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46155.

The product of its (nonzero) digits is 2400, while the sum is 24.

The square root of 53405421 is about 7307.9012719111. The cubic root of 53405421 is about 376.5839279290.

Adding to 53405421 its reverse (12450435), we get a palindrome (65855856).

The spelling of 53405421 in words is "fifty-three million, four hundred five thousand, four hundred twenty-one".