53604021 has 8 divisors (see below), whose sum is σ = 72018144. Its totient is φ = 35462960.

The previous prime is 53603993. The next prime is 53604113. The reversal of 53604021 is 12040635.

It is a happy number.

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 53604021 - 2¹⁴ = 53587637 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (53604521) 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, 67806 + ... + 68591.

It is an arithmetic number, because the mean of its divisors is an integer number (9002268).

Almost surely, 2^53604021 is an apocalyptic number.

It is an amenable number.

53604021 is a deficient number, since it is larger than the sum of its proper divisors (18414123).

53604021 is a wasteful number, since it uses less digits than its factorization.

53604021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136531.

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 53604021 is about 7321.4766953122. The cubic root of 53604021 is about 377.0501543314.

Adding to 53604021 its reverse (12040635), we get a palindrome (65644656).

The spelling of 53604021 in words is "fifty-three million, six hundred four thousand, twenty-one".