1021222640689 has 2 divisors, whose sum is σ = 1021222640690. Its totient is φ = 1021222640688.

The previous prime is 1021222640681. The next prime is 1021222640701. The reversal of 1021222640689 is 9860462221201.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1000016000064 + 21206640625 = 1000008^2 + 145625^2 .

It is a cyclic number.

It is not a de Polignac number, because 1021222640689 - 2³ = 1021222640681 is a prime.

It is not a weakly prime, because it can be changed into another prime (1021222640681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510611320344 + 510611320345.

It is an arithmetic number, because the mean of its divisors is an integer number (510611320345).

Almost surely, 2^{1021222640689} is an apocalyptic number.

It is an amenable number.

1021222640689 is a deficient number, since it is larger than the sum of its proper divisors (1).

1021222640689 is an equidigital number, since it uses as much as digits as its factorization.

1021222640689 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 165888, while the sum is 43.

The spelling of 1021222640689 in words is "one trillion, twenty-one billion, two hundred twenty-two million, six hundred forty thousand, six hundred eighty-nine".