52118821 has 4 divisors (see below), whose sum is σ = 55184652. Its totient is φ = 49052992.

The previous prime is 52118813. The next prime is 52118839. The reversal of 52118821 is 12881125.

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 23912100 + 28206721 = 4890^2 + 5311^2 .

It is a cyclic number.

It is not a de Polignac number, because 52118821 - 2³ = 52118813 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 52118821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (52112821) 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, 1532890 + ... + 1532923.

It is an arithmetic number, because the mean of its divisors is an integer number (13796163).

Almost surely, 2^52118821 is an apocalyptic number.

It is an amenable number.

52118821 is a deficient number, since it is larger than the sum of its proper divisors (3065831).

52118821 is a wasteful number, since it uses less digits than its factorization.

52118821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3065830.

The product of its digits is 1280, while the sum is 28.

The square root of 52118821 is about 7219.3366038716. The cubic root of 52118821 is about 373.5351947418.

Adding to 52118821 its reverse (12881125), we get a palindrome (64999946).

Subtracting from 52118821 its reverse (12881125), we obtain a square (39237696 = 6264²).

The spelling of 52118821 in words is "fifty-two million, one hundred eighteen thousand, eight hundred twenty-one".