1001222921 has 2 divisors, whose sum is σ = 1001222922. Its totient is φ = 1001222920.

The previous prime is 1001222909. The next prime is 1001222953. The reversal of 1001222921 is 1292221001.

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., 856381696 + 144841225 = 29264^2 + 12035^2 .

It is a cyclic number.

It is not a de Polignac number, because 1001222921 - 2⁶ = 1001222857 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1001222893 and 1001222902.

It is not a weakly prime, because it can be changed into another prime (1091222921) 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, 500611460 + 500611461.

It is an arithmetic number, because the mean of its divisors is an integer number (500611461).

Almost surely, 2^1001222921 is an apocalyptic number.

It is an amenable number.

1001222921 is a deficient number, since it is larger than the sum of its proper divisors (1).

1001222921 is an equidigital number, since it uses as much as digits as its factorization.

1001222921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 20.

The square root of 1001222921 is about 31642.1067724638. The cubic root of 1001222921 is about 1000.4074742755.

Adding to 1001222921 its reverse (1292221001), we get a palindrome (2293443922).

The spelling of 1001222921 in words is "one billion, one million, two hundred twenty-two thousand, nine hundred twenty-one".