22516213 has 2 divisors, whose sum is σ = 22516214. Its totient is φ = 22516212.

The previous prime is 22516201. The next prime is 22516237. The reversal of 22516213 is 31261522.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22496049 + 20164 = 4743^2 + 142^2 .

It is a cyclic number.

It is not a de Polignac number, because 22516213 - 2¹³ = 22508021 is a prime.

It is a super-2 number, since 2×22516213² = 1013959695722738, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22516283) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11258106 + 11258107.

It is an arithmetic number, because the mean of its divisors is an integer number (11258107).

Almost surely, 2^22516213 is an apocalyptic number.

It is an amenable number.

22516213 is a deficient number, since it is larger than the sum of its proper divisors (1).

22516213 is an equidigital number, since it uses as much as digits as its factorization.

22516213 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 720, while the sum is 22.

The square root of 22516213 is about 4745.1251827533. The cubic root of 22516213 is about 282.3786013487.

Adding to 22516213 its reverse (31261522), we get a palindrome (53777735).

It can be divided in two parts, 2251 and 6213, that added together give a square (8464 = 92²).

The spelling of 22516213 in words is "twenty-two million, five hundred sixteen thousand, two hundred thirteen".