53115021 has 30 divisors (see below), whose sum is σ = 84323690. Its totient is φ = 33312384.

The previous prime is 53114989. The next prime is 53115031. The reversal of 53115021 is 12051135.

53115021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 3 ways, for example, as 8037225 + 45077796 = 2835^2 + 6714^2 .

It is not a de Polignac number, because 53115021 - 2⁵ = 53114989 is a prime.

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 = 53114985 and 53115003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (53115031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 22275 + ... + 24543.

Almost surely, 2^53115021 is an apocalyptic number.

53115021 is a gapful number since it is divisible by the number (51) formed by its first and last digit.

It is an amenable number.

53115021 is a deficient number, since it is larger than the sum of its proper divisors (31208669).

53115021 is a wasteful number, since it uses less digits than its factorization.

53115021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2315 (or 2289 counting only the distinct ones).

The product of its (nonzero) digits is 150, while the sum is 18.

The square root of 53115021 is about 7288.0052826545. The cubic root of 53115021 is about 375.9001097446.

Adding to 53115021 its reverse (12051135), we get a palindrome (65166156).

The spelling of 53115021 in words is "fifty-three million, one hundred fifteen thousand, twenty-one".