53012021 has 4 divisors (see below), whose sum is σ = 53082444. Its totient is φ = 52941600.

The previous prime is 53011999. The next prime is 53012027. The reversal of 53012021 is 12021035.

It is a happy number.

53012021 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.

It can be written as a sum of positive squares in 2 ways, for example, as 970225 + 52041796 = 985^2 + 7214^2 .

It is a cyclic number.

It is not a de Polignac number, because 53012021 - 2¹⁸ = 52749877 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 53011987 and 53012005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (53012027) 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, 34070 + ... + 35591.

It is an arithmetic number, because the mean of its divisors is an integer number (13270611).

Almost surely, 2^53012021 is an apocalyptic number.

It is an amenable number.

53012021 is a deficient number, since it is larger than the sum of its proper divisors (70423).

53012021 is an equidigital number, since it uses as much as digits as its factorization.

53012021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70422.

The product of its (nonzero) digits is 60, while the sum is 14.

The square root of 53012021 is about 7280.9354481413. The cubic root of 53012021 is about 375.6569722131.

Adding to 53012021 its reverse (12021035), we get a palindrome (65033056).

The spelling of 53012021 in words is "fifty-three million, twelve thousand, twenty-one".