53117221 has 4 divisors (see below), whose sum is σ = 53155872. Its totient is φ = 53078572.

The previous prime is 53117219. The next prime is 53117227. The reversal of 53117221 is 12271135.

It is a happy number.

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.

It is a cyclic number.

It is not a de Polignac number, because 53117221 - 2¹ = 53117219 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 53117192 and 53117201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (53117227) 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, 17185 + ... + 20038.

It is an arithmetic number, because the mean of its divisors is an integer number (13288968).

Almost surely, 2^53117221 is an apocalyptic number.

It is an amenable number.

53117221 is a deficient number, since it is larger than the sum of its proper divisors (38651).

53117221 is a wasteful number, since it uses less digits than its factorization.

53117221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38650.

The product of its digits is 420, while the sum is 22.

The square root of 53117221 is about 7288.1562140229. The cubic root of 53117221 is about 375.9052995434.

Adding to 53117221 its reverse (12271135), we get a palindrome (65388356).

The spelling of 53117221 in words is "fifty-three million, one hundred seventeen thousand, two hundred twenty-one".