22140221 has 2 divisors, whose sum is σ = 22140222. Its totient is φ = 22140220.

The previous prime is 22140199. The next prime is 22140233. The reversal of 22140221 is 12204122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15960025 + 6180196 = 3995^2 + 2486^2 .

It is a cyclic number.

It is not a de Polignac number, because 22140221 - 2¹⁴ = 22123837 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 22140196 and 22140205.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22140241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11070110 + 11070111.

It is an arithmetic number, because the mean of its divisors is an integer number (11070111).

Almost surely, 2^22140221 is an apocalyptic number.

It is an amenable number.

22140221 is a deficient number, since it is larger than the sum of its proper divisors (1).

22140221 is an equidigital number, since it uses as much as digits as its factorization.

22140221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64, while the sum is 14.

The square root of 22140221 is about 4705.3396264244. The cubic root of 22140221 is about 280.7979829902.

Adding to 22140221 its reverse (12204122), we get a palindrome (34344343).

The spelling of 22140221 in words is "twenty-two million, one hundred forty thousand, two hundred twenty-one".