15212213 has 2 divisors, whose sum is σ = 15212214. Its totient is φ = 15212212.

The previous prime is 15212191. The next prime is 15212237. The reversal of 15212213 is 31221251.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14922769 + 289444 = 3863^2 + 538^2 .

It is an emirp because it is prime and its reverse (31221251) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 15212213 - 2¹² = 15208117 is a prime.

It is a super-2 number, since 2×15212213² = 462822848714738, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 15212191 and 15212200.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15212243) 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 as a sum of consecutive naturals, namely, 7606106 + 7606107.

It is an arithmetic number, because the mean of its divisors is an integer number (7606107).

Almost surely, 2^15212213 is an apocalyptic number.

It is an amenable number.

15212213 is a deficient number, since it is larger than the sum of its proper divisors (1).

15212213 is an equidigital number, since it uses as much as digits as its factorization.

15212213 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 120, while the sum is 17.

The square root of 15212213 is about 3900.2837076295. The cubic root of 15212213 is about 247.7787927340.

Adding to 15212213 its reverse (31221251), we get a palindrome (46433464).

The spelling of 15212213 in words is "fifteen million, two hundred twelve thousand, two hundred thirteen".