22001001221 has 2 divisors, whose sum is σ = 22001001222. Its totient is φ = 22001001220.

The previous prime is 22001001179. The next prime is 22001001271. The reversal of 22001001221 is 12210010022.

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., 15598761025 + 6402240196 = 124895^2 + 80014^2 .

It is a cyclic number.

It is not a de Polignac number, because 22001001221 - 2⁶ = 22001001157 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22001001271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11000500610 + 11000500611.

It is an arithmetic number, because the mean of its divisors is an integer number (11000500611).

Almost surely, 2^22001001221 is an apocalyptic number.

It is an amenable number.

22001001221 is a deficient number, since it is larger than the sum of its proper divisors (1).

22001001221 is an equidigital number, since it uses as much as digits as its factorization.

22001001221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 22001001221 its reverse (12210010022), we get a palindrome (34211011243).

The spelling of 22001001221 in words is "twenty-two billion, one million, one thousand, two hundred twenty-one".