53208021 has 16 divisors (see below), whose sum is σ = 72437120. Its totient is φ = 34732800.

The previous prime is 53208019. The next prime is 53208061. The reversal of 53208021 is 12080235.

It is not a de Polignac number, because 53208021 - 2¹ = 53208019 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 (53208061) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32265 + ... + 33873.

It is an arithmetic number, because the mean of its divisors is an integer number (4527320).

Almost surely, 2^53208021 is an apocalyptic number.

It is an amenable number.

53208021 is a deficient number, since it is larger than the sum of its proper divisors (19229099).

53208021 is a wasteful number, since it uses less digits than its factorization.

53208021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1836.

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 53208021 is about 7294.3828388699. The cubic root of 53208021 is about 376.1193718045.

Adding to 53208021 its reverse (12080235), we get a palindrome (65288256).

The spelling of 53208021 in words is "fifty-three million, two hundred eight thousand, twenty-one".