22220321 has 2 divisors, whose sum is σ = 22220322. Its totient is φ = 22220320.

The previous prime is 22220299. The next prime is 22220339. The reversal of 22220321 is 12302222.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22090000 + 130321 = 4700^2 + 361^2 .

It is a cyclic number.

It is not a de Polignac number, because 22220321 - 2⁶ = 22220257 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 22220296 and 22220305.

It is not a weakly prime, because it can be changed into another prime (22220371) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11110160 + 11110161.

It is an arithmetic number, because the mean of its divisors is an integer number (11110161).

Almost surely, 2^22220321 is an apocalyptic number.

It is an amenable number.

22220321 is a deficient number, since it is larger than the sum of its proper divisors (1).

22220321 is an equidigital number, since it uses as much as digits as its factorization.

22220321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96, while the sum is 14.

The square root of 22220321 is about 4713.8435485281. The cubic root of 22220321 is about 281.1362037740.

Adding to 22220321 its reverse (12302222), we get a palindrome (34522543).

The spelling of 22220321 in words is "twenty-two million, two hundred twenty thousand, three hundred twenty-one".