53303021 has 4 divisors (see below), whose sum is σ = 53542272. Its totient is φ = 53063772.

The previous prime is 53303011. The next prime is 53303023. The reversal of 53303021 is 12030335.

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: 12030335 = 5 ⋅2406067.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-53303021 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (53303023) 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, 119291 + ... + 119736.

It is an arithmetic number, because the mean of its divisors is an integer number (13385568).

Almost surely, 2^53303021 is an apocalyptic number.

It is an amenable number.

53303021 is a deficient number, since it is larger than the sum of its proper divisors (239251).

53303021 is a wasteful number, since it uses less digits than its factorization.

53303021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 239250.

The product of its (nonzero) digits is 270, while the sum is 17.

The square root of 53303021 is about 7300.8917948426. The cubic root of 53303021 is about 376.3430855434.

Adding to 53303021 its reverse (12030335), we get a palindrome (65333356).

The spelling of 53303021 in words is "fifty-three million, three hundred three thousand, twenty-one".