53615021 has 4 divisors (see below), whose sum is σ = 53755392. Its totient is φ = 53474652.

The previous prime is 53614999. The next prime is 53615039. The reversal of 53615021 is 12051635.

53615021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 a de Polignac number, because none of the positive numbers 2^k-53615021 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (53615071) 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 3 ways as a sum of consecutive naturals, for example, 69611 + ... + 70376.

It is an arithmetic number, because the mean of its divisors is an integer number (13438848).

Almost surely, 2^53615021 is an apocalyptic number.

It is an amenable number.

53615021 is a deficient number, since it is larger than the sum of its proper divisors (140371).

53615021 is a wasteful number, since it uses less digits than its factorization.

53615021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140370.

The product of its (nonzero) digits is 900, while the sum is 23.

The square root of 53615021 is about 7322.2278713517. The cubic root of 53615021 is about 377.0759438645.

Adding to 53615021 its reverse (12051635), we get a palindrome (65666656).

The spelling of 53615021 in words is "fifty-three million, six hundred fifteen thousand, twenty-one".