53113221 has 12 divisors (see below), whose sum is σ = 87679072. Its totient is φ = 30350376.

The previous prime is 53113217. The next prime is 53113237. The reversal of 53113221 is 12231135.

53113221 is a `hidden beast` number, since 531 + 132 + 2 + 1 = 666.

It is not a de Polignac number, because 53113221 - 2² = 53113217 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 53113194 and 53113203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (53113271) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 421471 + ... + 421596.

Almost surely, 2^53113221 is an apocalyptic number.

It is an amenable number.

53113221 is a deficient number, since it is larger than the sum of its proper divisors (34565851).

53113221 is a wasteful number, since it uses less digits than its factorization.

53113221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 843080 (or 843077 counting only the distinct ones).

The product of its digits is 180, while the sum is 18.

The square root of 53113221 is about 7287.8817910282. The cubic root of 53113221 is about 375.8958634389.

Adding to 53113221 its reverse (12231135), we get a palindrome (65344356).

The spelling of 53113221 in words is "fifty-three million, one hundred thirteen thousand, two hundred twenty-one".