52316021 has 4 divisors (see below), whose sum is σ = 55393452. Its totient is φ = 49238592.

The previous prime is 52315981. The next prime is 52316051. The reversal of 52316021 is 12061325.

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 45711121 + 6604900 = 6761^2 + 2570^2 .

It is a cyclic number.

It is not a de Polignac number, because 52316021 - 2¹⁸ = 52053877 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 52315984 and 52316002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (52316051) 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, 1538690 + ... + 1538723.

It is an arithmetic number, because the mean of its divisors is an integer number (13848363).

Almost surely, 2^52316021 is an apocalyptic number.

It is an amenable number.

52316021 is a deficient number, since it is larger than the sum of its proper divisors (3077431).

52316021 is a wasteful number, since it uses less digits than its factorization.

52316021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3077430.

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 52316021 is about 7232.9814737769. The cubic root of 52316021 is about 374.0057121150.

Adding to 52316021 its reverse (12061325), we get a palindrome (64377346).

The spelling of 52316021 in words is "fifty-two million, three hundred sixteen thousand, twenty-one".