53406421 has 8 divisors (see below), whose sum is σ = 54109184. Its totient is φ = 52708320.

The previous prime is 53406407. The next prime is 53406439. The reversal of 53406421 is 12460435.

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

It is a cyclic number.

It is not a de Polignac number, because 53406421 - 2⁹ = 53405909 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 (53406481) 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, 25801 + ... + 27793.

It is an arithmetic number, because the mean of its divisors is an integer number (6763648).

Almost surely, 2^53406421 is an apocalyptic number.

It is an amenable number.

53406421 is a deficient number, since it is larger than the sum of its proper divisors (702763).

53406421 is a wasteful number, since it uses less digits than its factorization.

53406421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2331.

The product of its (nonzero) digits is 2880, while the sum is 25.

The square root of 53406421 is about 7307.9696906870. The cubic root of 53406421 is about 376.5862783869.

Adding to 53406421 its reverse (12460435), we get a palindrome (65866856).

The spelling of 53406421 in words is "fifty-three million, four hundred six thousand, four hundred twenty-one".