1022221000991 has 2 divisors, whose sum is σ = 1022221000992. Its totient is φ = 1022221000990.

The previous prime is 1022221000987. The next prime is 1022221001029. The reversal of 1022221000991 is 1990001222201.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1022221000991 - 2² = 1022221000987 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1022221000391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 511110500495 + 511110500496.

It is an arithmetic number, because the mean of its divisors is an integer number (511110500496).

Almost surely, 2^{1022221000991} is an apocalyptic number.

1022221000991 is a deficient number, since it is larger than the sum of its proper divisors (1).

1022221000991 is an equidigital number, since it uses as much as digits as its factorization.

1022221000991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1296, while the sum is 29.

The spelling of 1022221000991 in words is "one trillion, twenty-two billion, two hundred twenty-one million, nine hundred ninety-one", and thus it is an aban number.