53115621 has 32 divisors (see below), whose sum is σ = 82199040. Its totient is φ = 30227904.

The previous prime is 53115619. The next prime is 53115631. The reversal of 53115621 is 12651135.

It is not a de Polignac number, because 53115621 - 2¹ = 53115619 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 53115591 and 53115600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (53115631) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 31030 + ... + 32696.

It is an arithmetic number, because the mean of its divisors is an integer number (2568720).

Almost surely, 2^53115621 is an apocalyptic number.

It is an amenable number.

53115621 is a deficient number, since it is larger than the sum of its proper divisors (29083419).

53115621 is a wasteful number, since it uses less digits than its factorization.

53115621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1745.

The product of its digits is 900, while the sum is 24.

The square root of 53115621 is about 7288.0464460650. The cubic root of 53115621 is about 375.9015251585.

Adding to 53115621 its reverse (12651135), we get a palindrome (65766756).

The spelling of 53115621 in words is "fifty-three million, one hundred fifteen thousand, six hundred twenty-one".