5123221 has 2 divisors, whose sum is σ = 5123222. Its totient is φ = 5123220.

The previous prime is 5123219. The next prime is 5123231. The reversal of 5123221 is 1223215.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4884100 + 239121 = 2210^2 + 489^2 .

It is a cyclic number.

It is not a de Polignac number, because 5123221 - 2¹ = 5123219 is a prime.

Together with 5123219, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 5123195 and 5123204.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5123201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2561610 + 2561611.

It is an arithmetic number, because the mean of its divisors is an integer number (2561611).

Almost surely, 2^5123221 is an apocalyptic number.

It is an amenable number.

5123221 is a deficient number, since it is larger than the sum of its proper divisors (1).

5123221 is an equidigital number, since it uses as much as digits as its factorization.

5123221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 120, while the sum is 16.

The square root of 5123221 is about 2263.4533350613. The cubic root of 5123221 is about 172.3909105121.

Adding to 5123221 its reverse (1223215), we get a palindrome (6346436).

The spelling of 5123221 in words is "five million, one hundred twenty-three thousand, two hundred twenty-one".