53430221 has 4 divisors (see below), whose sum is σ = 57540252. Its totient is φ = 49320192.

The previous prime is 53430197. The next prime is 53430229. The reversal of 53430221 is 12203435.

It is a happy number.

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 17598025 + 35832196 = 4195^2 + 5986^2 .

It is a cyclic number.

It is not a de Polignac number, because 53430221 - 2¹⁸ = 53168077 is a prime.

It is a super-2 number, since 2×53430221² = 5709577032217682, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 53430193 and 53430202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (53430229) 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, 2054996 + ... + 2055021.

It is an arithmetic number, because the mean of its divisors is an integer number (14385063).

Almost surely, 2^53430221 is an apocalyptic number.

It is an amenable number.

53430221 is a deficient number, since it is larger than the sum of its proper divisors (4110031).

53430221 is a wasteful number, since it uses less digits than its factorization.

53430221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4110030.

The product of its (nonzero) digits is 720, while the sum is 20.

The square root of 53430221 is about 7309.5978685561. The cubic root of 53430221 is about 376.6422106275.

Adding to 53430221 its reverse (12203435), we get a palindrome (65633656).

The spelling of 53430221 in words is "fifty-three million, four hundred thirty thousand, two hundred twenty-one".