22210421 has 2 divisors, whose sum is σ = 22210422. Its totient is φ = 22210420.

The previous prime is 22210379. The next prime is 22210427. The reversal of 22210421 is 12401222.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22193521 + 16900 = 4711^2 + 130^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22210421 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 22210396 and 22210405.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22210427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11105210 + 11105211.

It is an arithmetic number, because the mean of its divisors is an integer number (11105211).

Almost surely, 2^22210421 is an apocalyptic number.

It is an amenable number.

22210421 is a deficient number, since it is larger than the sum of its proper divisors (1).

22210421 is an equidigital number, since it uses as much as digits as its factorization.

22210421 is an odious number, because the sum of its binary digits is odd.

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

The square root of 22210421 is about 4712.7933330457. The cubic root of 22210421 is about 281.0944452733.

Adding to 22210421 its reverse (12401222), we get a palindrome (34611643).

The spelling of 22210421 in words is "twenty-two million, two hundred ten thousand, four hundred twenty-one".