52221521 has 8 divisors (see below), whose sum is σ = 57021888. Its totient is φ = 47430000.

The previous prime is 52221509. The next prime is 52221527. The reversal of 52221521 is 12512225.

It is a happy number.

52221521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 52221521 - 2¹⁴ = 52205137 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 52221493 and 52221502.

It is not an unprimeable number, because it can be changed into a prime (52221527) 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 7 ways as a sum of consecutive naturals, for example, 19196 + ... + 21746.

It is an arithmetic number, because the mean of its divisors is an integer number (7127736).

Almost surely, 2^52221521 is an apocalyptic number.

It is an amenable number.

52221521 is a deficient number, since it is larger than the sum of its proper divisors (4800367).

52221521 is a wasteful number, since it uses less digits than its factorization.

52221521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4423.

The product of its digits is 400, while the sum is 20.

The square root of 52221521 is about 7226.4459452763. The cubic root of 52221521 is about 373.7803838045.

Adding to 52221521 its reverse (12512225), we get a palindrome (64733746).

The spelling of 52221521 in words is "fifty-two million, two hundred twenty-one thousand, five hundred twenty-one".