53130221 has 4 divisors (see below), whose sum is σ = 54132732. Its totient is φ = 52127712.

The previous prime is 53130199. The next prime is 53130247. The reversal of 53130221 is 12203135.

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 43705321 + 9424900 = 6611^2 + 3070^2 .

It is a cyclic number.

It is not a de Polignac number, because 53130221 - 2⁶ = 53130157 is a prime.

It is a super-3 number, since 3×53130221³ (a number of 24 digits) contains 333 as substring.

It is a Duffinian number.

53130221 is a modest number, since divided by 130221 gives 53 as remainder.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 53130221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (53130281) 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, 501176 + ... + 501281.

It is an arithmetic number, because the mean of its divisors is an integer number (13533183).

Almost surely, 2^53130221 is an apocalyptic number.

It is an amenable number.

53130221 is a deficient number, since it is larger than the sum of its proper divisors (1002511).

53130221 is a wasteful number, since it uses less digits than its factorization.

53130221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1002510.

The product of its (nonzero) digits is 180, while the sum is 17.

The square root of 53130221 is about 7289.0480174025. The cubic root of 53130221 is about 375.9359636117.

Adding to 53130221 its reverse (12203135), we get a palindrome (65333356).

The spelling of 53130221 in words is "fifty-three million, one hundred thirty thousand, two hundred twenty-one".