53375021 has 4 divisors (see below), whose sum is σ = 61000032. Its totient is φ = 45750012.

The previous prime is 53375017. The next prime is 53375039. The reversal of 53375021 is 12057335.

53375021 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 not a de Polignac number, because 53375021 - 2² = 53375017 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (53375821) 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, 3812495 + ... + 3812508.

It is an arithmetic number, because the mean of its divisors is an integer number (15250008).

Almost surely, 2^53375021 is an apocalyptic number.

It is an amenable number.

53375021 is a deficient number, since it is larger than the sum of its proper divisors (7625011).

53375021 is an equidigital number, since it uses as much as digits as its factorization.

53375021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7625010.

The product of its (nonzero) digits is 3150, while the sum is 26.

The square root of 53375021 is about 7305.8210353115. The cubic root of 53375021 is about 376.5124600013.

The spelling of 53375021 in words is "fifty-three million, three hundred seventy-five thousand, twenty-one".