52222221 has 6 divisors (see below), whose sum is σ = 75432110. Its totient is φ = 34814808.

The previous prime is 52222199. The next prime is 52222223. The reversal of 52222221 is 12222225.

52222221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 51194025 + 1028196 = 7155^2 + 1014^2 .

It is not a de Polignac number, because 52222221 - 2²¹ = 50125069 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 52222194 and 52222203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (52222223) 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 5 ways as a sum of consecutive naturals, for example, 2901226 + ... + 2901243.

Almost surely, 2^52222221 is an apocalyptic number.

It is an amenable number.

52222221 is a deficient number, since it is larger than the sum of its proper divisors (23209889).

52222221 is a wasteful number, since it uses less digits than its factorization.

52222221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5802475 (or 5802472 counting only the distinct ones).

The product of its digits is 320, while the sum is 18.

The square root of 52222221 is about 7226.4943783276. The cubic root of 52222221 is about 373.7820539020.

Adding to 52222221 its reverse (12222225), we get a palindrome (64444446).

The spelling of 52222221 in words is "fifty-two million, two hundred twenty-two thousand, two hundred twenty-one".