53246821 has 4 divisors (see below), whose sum is σ = 54251532. Its totient is φ = 52242112.

The previous prime is 53246801. The next prime is 53246849. The reversal of 53246821 is 12864235.

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 26061025 + 27185796 = 5105^2 + 5214^2 .

It is a cyclic number.

It is not a de Polignac number, because 53246821 - 2⁹ = 53246309 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (53246801) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 502276 + ... + 502381.

It is an arithmetic number, because the mean of its divisors is an integer number (13562883).

Almost surely, 2^53246821 is an apocalyptic number.

It is an amenable number.

53246821 is a deficient number, since it is larger than the sum of its proper divisors (1004711).

53246821 is a wasteful number, since it uses less digits than its factorization.

53246821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1004710.

The product of its digits is 11520, while the sum is 31.

The square root of 53246821 is about 7297.0419349213. The cubic root of 53246821 is about 376.2107733486.

The spelling of 53246821 in words is "fifty-three million, two hundred forty-six thousand, eight hundred twenty-one".