53553421 has 4 divisors (see below), whose sum is σ = 54859644. Its totient is φ = 52247200.

The previous prime is 53553413. The next prime is 53553439. The reversal of 53553421 is 12435535.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 26409321 + 27144100 = 5139^2 + 5210^2 .

It is a cyclic number.

It is not a de Polignac number, because 53553421 - 2³ = 53553413 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 53553421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (53553481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 653050 + ... + 653131.

It is an arithmetic number, because the mean of its divisors is an integer number (13714911).

Almost surely, 2^53553421 is an apocalyptic number.

It is an amenable number.

53553421 is a deficient number, since it is larger than the sum of its proper divisors (1306223).

53553421 is a wasteful number, since it uses less digits than its factorization.

53553421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1306222.

The product of its digits is 9000, while the sum is 28.

The square root of 53553421 is about 7318.0202924015. The cubic root of 53553421 is about 376.9314770146.

Adding to 53553421 its reverse (12435535), we get a palindrome (65988956).

It can be divided in two parts, 535 and 53421, that added together give a triangular number (53956 = T₃₂₈).

The spelling of 53553421 in words is "fifty-three million, five hundred fifty-three thousand, four hundred twenty-one".