53400421 has 4 divisors (see below), whose sum is σ = 53720352. Its totient is φ = 53080492.

The previous prime is 53400377. The next prime is 53400433. The reversal of 53400421 is 12400435.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12400435 = 5 ⋅2480087.

It is a cyclic number.

It is not a de Polignac number, because 53400421 - 2⁹ = 53399909 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 (53400481) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 159715 + ... + 160048.

It is an arithmetic number, because the mean of its divisors is an integer number (13430088).

Almost surely, 2^53400421 is an apocalyptic number.

It is an amenable number.

53400421 is a deficient number, since it is larger than the sum of its proper divisors (319931).

53400421 is a wasteful number, since it uses less digits than its factorization.

53400421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 319930.

The product of its (nonzero) digits is 480, while the sum is 19.

The square root of 53400421 is about 7307.5591684228. The cubic root of 53400421 is about 376.5721751995.

Adding to 53400421 its reverse (12400435), we get a palindrome (65800856).

The spelling of 53400421 in words is "fifty-three million, four hundred thousand, four hundred twenty-one".